diff --git a/TESTS/mbed_drivers/lp_ticker/main.cpp b/TESTS/mbed_drivers/lp_ticker/main.cpp
index 1d687cc28d1..7e706c89369 100644
--- a/TESTS/mbed_drivers/lp_ticker/main.cpp
+++ b/TESTS/mbed_drivers/lp_ticker/main.cpp
@@ -33,8 +33,9 @@ static const int test_timeout = 10;
 /* Due to poor accuracy of LowPowerTicker on many platforms
    there is no sense to tune tolerance value as it was in Ticker tests.
 
-   Tolerance value is set to 2000us to cover this diversity */
-#define TOLERANCE_US 2000
+   Tolerance value is set to 500us for measurement inaccuracy + 5% tolerance
+   for LowPowerTicker. */
+#define TOLERANCE_US(DELAY) (500 + DELAY / 20)
 
 
 volatile uint32_t ticker_callback_flag;
@@ -117,7 +118,7 @@ void test_multi_call_time(void)
         while(!ticker_callback_flag);
         time_diff = gtimer.read_us();
 
-        TEST_ASSERT_UINT32_WITHIN(TOLERANCE_US, MULTI_TICKER_TIME_MS * 1000, time_diff);
+        TEST_ASSERT_UINT32_WITHIN(TOLERANCE_US(MULTI_TICKER_TIME_MS * 1000), MULTI_TICKER_TIME_MS * 1000, time_diff);
     }
 }
 
@@ -167,7 +168,7 @@ void test_attach_time(void)
     ticker.detach();
     const int time_diff = gtimer.read_us();
 
-    TEST_ASSERT_UINT64_WITHIN(TOLERANCE_US, DELAY_US, time_diff);
+    TEST_ASSERT_UINT64_WITHIN(TOLERANCE_US(DELAY_US), DELAY_US, time_diff);
 }
 
 /** Test single callback time via attach_us
@@ -189,7 +190,7 @@ void test_attach_us_time(void)
     ticker.detach();
     const int time_diff = gtimer.read_us();
 
-    TEST_ASSERT_UINT64_WITHIN(TOLERANCE_US, DELAY_US, time_diff);
+    TEST_ASSERT_UINT64_WITHIN(TOLERANCE_US(DELAY_US), DELAY_US, time_diff);
 }
 
 // Test cases
diff --git a/TESTS/mbed_drivers/timer/main.cpp b/TESTS/mbed_drivers/timer/main.cpp
index 55eab966a85..51ac5f801c2 100644
--- a/TESTS/mbed_drivers/timer/main.cpp
+++ b/TESTS/mbed_drivers/timer/main.cpp
@@ -30,35 +30,24 @@ using namespace utest::v1;
 
 extern uint32_t SystemCoreClock;
 
-/* Macro to define delta based on CPU clock frequency.
- *
- * Note that some extra time is counted by the timer.
- * Additional time is caused by the function calls and
- * additional operations performed by wait and
- * stop functions before in fact timer is stopped. This may
- * add additional time to the counted result.
- *
- * To take in to account this extra time we introduce DELTA
- * value based on CPU clock (speed):
- *   DELTA = TOLERANCE_FACTOR / SystemCoreClock * US_FACTOR
- *
- *   e.g.
- *   For K64F          DELTA = (30000 / 120000000) * 1000000 = 250[us]
- *   For NUCLEO_F070RB DELTA = (30000 /  48000000) * 1000000 = 625[us]
- *   For NRF51_DK      DELTA = (30000 /  16000000) * 1000000 = 1875[us]
- */
 #define US_PER_SEC       1000000
 #define US_PER_MSEC      1000
-#define TOLERANCE_FACTOR 30000.0f
-#define US_FACTOR        1000000.0f
+#define MSEC_PER_SEC     1000
 
-static const int delta_sys_clk_us = ((int) (TOLERANCE_FACTOR / (float)SystemCoreClock * US_FACTOR));
-
-/* When test performs time measurement using Timer in sequence, then measurement error accumulates
- * in the successive attempts. */
- #define DELTA_US(i) (delta_sys_clk_us * i)
- #define DELTA_S(i)  ((float)delta_sys_clk_us * i / US_PER_SEC)
- #define DELTA_MS(i) (1 + ( (i * delta_sys_clk_us) / US_PER_MSEC))
+ /*
+ * Define tolerance as follows:
+ * tolerance = 500 us + 2% of measured time
+ *
+ * e.g.
+ * 1 ms delay: tolerance = 520 us
+ * 10 ms delay: tolerance = 700 us
+ * 100 ms delay: tolerance = 2500 us
+ * 1000 ms delay: tolerance = 20500 us
+ *
+ *  */
+#define DELTA_US(delay_ms) (500 + delay_ms * US_PER_MSEC / 50)
+#define DELTA_MS(delay_ms) (1 + (delay_ms * US_PER_MSEC / 50 / US_PER_MSEC))
+#define DELTA_S(delay_ms) (0.000500f + (((float)delay_ms) / MSEC_PER_SEC / 50))
 
 #define TICKER_FREQ_1MHZ 1000000
 #define TICKER_BITS 32
@@ -417,10 +406,10 @@ void test_timer_time_accumulation_os_ticker()
     p_timer->stop();
 
     /* Check results - totally 10 ms have elapsed. */
-    TEST_ASSERT_FLOAT_WITHIN(DELTA_S(1), 0.010f, p_timer->read());
-    TEST_ASSERT_INT32_WITHIN(DELTA_MS(1), 10, p_timer->read_ms());
-    TEST_ASSERT_INT32_WITHIN(DELTA_US(1), 10000, p_timer->read_us());
-    TEST_ASSERT_UINT64_WITHIN(DELTA_US(1), 10000, p_timer->read_high_resolution_us());
+    TEST_ASSERT_FLOAT_WITHIN(DELTA_S(10), 0.010f, p_timer->read());
+    TEST_ASSERT_INT32_WITHIN(DELTA_MS(10), 10, p_timer->read_ms());
+    TEST_ASSERT_INT32_WITHIN(DELTA_US(10), 10000, p_timer->read_us());
+    TEST_ASSERT_UINT64_WITHIN(DELTA_US(10), 10000, p_timer->read_high_resolution_us());
 
     /* Wait 50 ms - this is done to show that time elapsed when
      * the timer is stopped does not have influence on the
@@ -439,10 +428,10 @@ void test_timer_time_accumulation_os_ticker()
     p_timer->stop();
 
     /* Check results - totally 30 ms have elapsed. */
-    TEST_ASSERT_FLOAT_WITHIN(DELTA_S(2), 0.030f, p_timer->read());
-    TEST_ASSERT_INT32_WITHIN(DELTA_MS(2), 30, p_timer->read_ms());
-    TEST_ASSERT_INT32_WITHIN(DELTA_US(2), 30000, p_timer->read_us());
-    TEST_ASSERT_UINT64_WITHIN(DELTA_US(2), 30000, p_timer->read_high_resolution_us());
+    TEST_ASSERT_FLOAT_WITHIN(DELTA_S(30), 0.030f, p_timer->read());
+    TEST_ASSERT_INT32_WITHIN(DELTA_MS(30), 30, p_timer->read_ms());
+    TEST_ASSERT_INT32_WITHIN(DELTA_US(30), 30000, p_timer->read_us());
+    TEST_ASSERT_UINT64_WITHIN(DELTA_US(30), 30000, p_timer->read_high_resolution_us());
 
     /* Wait 50 ms - this is done to show that time elapsed when
      * the timer is stopped does not have influence on the
@@ -460,10 +449,10 @@ void test_timer_time_accumulation_os_ticker()
     p_timer->stop();
 
     /* Check results - totally 60 ms have elapsed. */
-    TEST_ASSERT_FLOAT_WITHIN(DELTA_S(3), 0.060f, p_timer->read());
-    TEST_ASSERT_INT32_WITHIN(DELTA_MS(3), 60, p_timer->read_ms());
-    TEST_ASSERT_INT32_WITHIN(DELTA_US(3), 60000, p_timer->read_us());
-    TEST_ASSERT_UINT64_WITHIN(DELTA_US(3), 60000, p_timer->read_high_resolution_us());
+    TEST_ASSERT_FLOAT_WITHIN(DELTA_S(60), 0.060f, p_timer->read());
+    TEST_ASSERT_INT32_WITHIN(DELTA_MS(60), 60, p_timer->read_ms());
+    TEST_ASSERT_INT32_WITHIN(DELTA_US(60), 60000, p_timer->read_us());
+    TEST_ASSERT_UINT64_WITHIN(DELTA_US(60), 60000, p_timer->read_high_resolution_us());
 
     /* Wait 50 ms - this is done to show that time elapsed when
      * the timer is stopped does not have influence on the
@@ -482,10 +471,10 @@ void test_timer_time_accumulation_os_ticker()
     p_timer->stop();
 
     /* Check results - totally 1060 ms have elapsed. */
-    TEST_ASSERT_FLOAT_WITHIN(DELTA_S(4), 1.060f, p_timer->read());
-    TEST_ASSERT_INT32_WITHIN(DELTA_MS(4), 1060, p_timer->read_ms());
-    TEST_ASSERT_INT32_WITHIN(DELTA_US(4), 1060000, p_timer->read_us());
-    TEST_ASSERT_UINT64_WITHIN(DELTA_US(4), 1060000, p_timer->read_high_resolution_us());
+    TEST_ASSERT_FLOAT_WITHIN(DELTA_S(1060), 1.060f, p_timer->read());
+    TEST_ASSERT_INT32_WITHIN(DELTA_MS(1060), 1060, p_timer->read_ms());
+    TEST_ASSERT_INT32_WITHIN(DELTA_US(1060), 1060000, p_timer->read_us());
+    TEST_ASSERT_UINT64_WITHIN(DELTA_US(1060), 1060000, p_timer->read_high_resolution_us());
 }
 
 /* This test verifies if reset() function resets the timer
@@ -511,10 +500,10 @@ void test_timer_reset_os_ticker()
     p_timer->stop();
 
     /* Check results - totally 10 ms elapsed. */
-    TEST_ASSERT_FLOAT_WITHIN(DELTA_S(1), 0.010f, p_timer->read());
-    TEST_ASSERT_INT32_WITHIN(DELTA_MS(1), 10, p_timer->read_ms());
-    TEST_ASSERT_INT32_WITHIN(DELTA_US(1), 10000, p_timer->read_us());
-    TEST_ASSERT_UINT64_WITHIN(DELTA_US(1), 10000, p_timer->read_high_resolution_us());
+    TEST_ASSERT_FLOAT_WITHIN(DELTA_S(10), 0.010f, p_timer->read());
+    TEST_ASSERT_INT32_WITHIN(DELTA_MS(10), 10, p_timer->read_ms());
+    TEST_ASSERT_INT32_WITHIN(DELTA_US(10), 10000, p_timer->read_us());
+    TEST_ASSERT_UINT64_WITHIN(DELTA_US(10), 10000, p_timer->read_high_resolution_us());
 
     /* Reset the timer - previous measured time should be lost now. */
     p_timer->reset();
@@ -529,10 +518,10 @@ void test_timer_reset_os_ticker()
     p_timer->stop();
 
     /* Check results - 20 ms elapsed since the reset. */
-    TEST_ASSERT_FLOAT_WITHIN(DELTA_S(1), 0.020f, p_timer->read());
-    TEST_ASSERT_INT32_WITHIN(DELTA_MS(1), 20, p_timer->read_ms());
-    TEST_ASSERT_INT32_WITHIN(DELTA_US(1), 20000, p_timer->read_us());
-    TEST_ASSERT_UINT64_WITHIN(DELTA_US(1), 20000, p_timer->read_high_resolution_us());
+    TEST_ASSERT_FLOAT_WITHIN(DELTA_S(20), 0.020f, p_timer->read());
+    TEST_ASSERT_INT32_WITHIN(DELTA_MS(20), 20, p_timer->read_ms());
+    TEST_ASSERT_INT32_WITHIN(DELTA_US(20), 20000, p_timer->read_us());
+    TEST_ASSERT_UINT64_WITHIN(DELTA_US(20), 20000, p_timer->read_high_resolution_us());
 }
 
 /* This test verifies if reset() function resets the timer
@@ -613,10 +602,10 @@ void test_timer_start_started_timer_os_ticker()
     p_timer->stop();
 
     /* Check results - 30 ms have elapsed since the first start. */
-    TEST_ASSERT_FLOAT_WITHIN(DELTA_S(2), 0.030f, p_timer->read());
-    TEST_ASSERT_INT32_WITHIN(DELTA_MS(2), 30, p_timer->read_ms());
-    TEST_ASSERT_INT32_WITHIN(DELTA_US(2), 30000, p_timer->read_us());
-    TEST_ASSERT_UINT64_WITHIN(DELTA_US(2), 30000, p_timer->read_high_resolution_us());
+    TEST_ASSERT_FLOAT_WITHIN(DELTA_S(30), 0.030f, p_timer->read());
+    TEST_ASSERT_INT32_WITHIN(DELTA_MS(30), 30, p_timer->read_ms());
+    TEST_ASSERT_INT32_WITHIN(DELTA_US(30), 30000, p_timer->read_us());
+    TEST_ASSERT_UINT64_WITHIN(DELTA_US(30), 30000, p_timer->read_high_resolution_us());
 }
 
 /* This test verifies if calling start() for already
@@ -650,10 +639,10 @@ void test_timer_start_started_timer_user_ticker()
     p_timer->stop();
 
     /* Check results - 30 ms have elapsed since the first start. */
-    TEST_ASSERT_FLOAT_WITHIN(DELTA_S(2), 0.030f, p_timer->read());
-    TEST_ASSERT_INT32_WITHIN(DELTA_MS(2), 30, p_timer->read_ms());
-    TEST_ASSERT_INT32_WITHIN(DELTA_US(2), 30000, p_timer->read_us());
-    TEST_ASSERT_UINT64_WITHIN(DELTA_US(2), 30000, p_timer->read_high_resolution_us());
+    TEST_ASSERT_FLOAT_WITHIN(DELTA_S(30), 0.030f, p_timer->read());
+    TEST_ASSERT_INT32_WITHIN(DELTA_MS(30), 30, p_timer->read_ms());
+    TEST_ASSERT_INT32_WITHIN(DELTA_US(30), 30000, p_timer->read_us());
+    TEST_ASSERT_UINT64_WITHIN(DELTA_US(30), 30000, p_timer->read_high_resolution_us());
 }
 
 /* This test verifies Timer float operator.
@@ -677,7 +666,7 @@ void test_timer_float_operator_os_ticker()
     p_timer->stop();
 
     /* Check result - 10 ms elapsed. */
-    TEST_ASSERT_FLOAT_WITHIN(DELTA_S(1), 0.010f, (float)(*p_timer));
+    TEST_ASSERT_FLOAT_WITHIN(DELTA_S(10), 0.010f, (float)(*p_timer));
 }
 
 /* This test verifies Timer float operator.
@@ -732,10 +721,10 @@ void test_timer_time_measurement()
     p_timer->stop();
 
     /* Check results. */
-    TEST_ASSERT_FLOAT_WITHIN(DELTA_S(1), (float)wait_val_us / 1000000, p_timer->read());
-    TEST_ASSERT_INT32_WITHIN(DELTA_MS(1), wait_val_us / 1000, p_timer->read_ms());
-    TEST_ASSERT_INT32_WITHIN(DELTA_US(1), wait_val_us, p_timer->read_us());
-    TEST_ASSERT_UINT64_WITHIN(DELTA_US(1), wait_val_us, p_timer->read_high_resolution_us());
+    TEST_ASSERT_FLOAT_WITHIN(DELTA_S(wait_val_us / US_PER_MSEC), (float)wait_val_us / US_PER_SEC, p_timer->read());
+    TEST_ASSERT_INT32_WITHIN(DELTA_MS(wait_val_us / US_PER_MSEC), wait_val_us / US_PER_MSEC, p_timer->read_ms());
+    TEST_ASSERT_INT32_WITHIN(DELTA_US(wait_val_us / US_PER_MSEC), wait_val_us, p_timer->read_us());
+    TEST_ASSERT_UINT64_WITHIN(DELTA_US(wait_val_us / US_PER_MSEC), wait_val_us, p_timer->read_high_resolution_us());
 }
 
 utest::v1::status_t test_setup(const size_t number_of_cases) {
diff --git a/TESTS/mbed_drivers/timerevent/main.cpp b/TESTS/mbed_drivers/timerevent/main.cpp
index 5dee5786459..aeb155b2b84 100644
--- a/TESTS/mbed_drivers/timerevent/main.cpp
+++ b/TESTS/mbed_drivers/timerevent/main.cpp
@@ -23,6 +23,10 @@
 
 using namespace utest::v1;
 
+#if !DEVICE_USTICKER
+  #error [NOT_SUPPORTED] test not supported
+#endif
+
 #define TEST_DELAY_US 50000ULL
 
 class TestTimerEvent: public TimerEvent {
diff --git a/TESTS/mbed_hal/common_tickers/main.cpp b/TESTS/mbed_hal/common_tickers/main.cpp
index 4724c1ed6e6..fd0498381d9 100644
--- a/TESTS/mbed_hal/common_tickers/main.cpp
+++ b/TESTS/mbed_hal/common_tickers/main.cpp
@@ -40,7 +40,7 @@
 
 #define NUM_OF_CYCLES 100000
 
-#define US_TICKER_OV_LIMIT 20000
+#define US_TICKER_OV_LIMIT 35000
 #define LP_TICKER_OV_LIMIT 4000
 
 using namespace utest::v1;
diff --git a/TESTS/mbed_hal/lp_ticker/main.cpp b/TESTS/mbed_hal/lp_ticker/main.cpp
index 361a5808af6..dfea8facc8f 100644
--- a/TESTS/mbed_hal/lp_ticker/main.cpp
+++ b/TESTS/mbed_hal/lp_ticker/main.cpp
@@ -87,6 +87,7 @@ void lp_ticker_info_test()
     TEST_ASSERT(p_ticker_info->bits >= 12);
 }
 
+#if DEVICE_SLEEP
 /* Test that the ticker continues operating in deep sleep mode. */
 void lp_ticker_deepsleep_test()
 {
@@ -115,6 +116,7 @@ void lp_ticker_deepsleep_test()
 
     TEST_ASSERT_EQUAL(1, intFlag);
 }
+#endif
 
 /* Test that the ticker does not glitch backwards due to an incorrectly implemented ripple counter driver. */
 void lp_ticker_glitch_test()
@@ -141,7 +143,9 @@ utest::v1::status_t test_setup(const size_t number_of_cases)
 
 Case cases[] = {
     Case("lp ticker info test", lp_ticker_info_test),
+#if DEVICE_SLEEP
     Case("lp ticker sleep test", lp_ticker_deepsleep_test),
+#endif
     Case("lp ticker glitch test", lp_ticker_glitch_test)
 };
 
diff --git a/targets/TARGET_NORDIC/TARGET_NRF5/common_rtc.c b/targets/TARGET_NORDIC/TARGET_NRF5/common_rtc.c
new file mode 100644
index 00000000000..efeea8b608b
--- /dev/null
+++ b/targets/TARGET_NORDIC/TARGET_NRF5/common_rtc.c
@@ -0,0 +1,239 @@
+/*
+ * Copyright (c) 2013 Nordic Semiconductor ASA
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright notice, this list
+ *      of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form, except as embedded into a Nordic Semiconductor ASA
+ *      integrated circuit in a product or a software update for such product, must reproduce
+ *      the above copyright notice, this list of conditions and the following disclaimer in
+ *      the documentation and/or other materials provided with the distribution.
+ *
+ *   3. Neither the name of Nordic Semiconductor ASA nor the names of its contributors may be
+ *      used to endorse or promote products derived from this software without specific prior
+ *      written permission.
+ *
+ *   4. This software, with or without modification, must only be used with a
+ *      Nordic Semiconductor ASA integrated circuit.
+ *
+ *   5. Any software provided in binary or object form under this license must not be reverse
+ *      engineered, decompiled, modified and/or disassembled.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include "us_ticker_api.h"
+#include "common_rtc.h"
+#include "app_util.h"
+#include "nrf_drv_common.h"
+#include "lp_ticker_api.h"
+#include "mbed_critical.h"
+
+#if defined(NRF52_ERRATA_20)
+    #include "softdevice_handler.h"
+#endif
+
+
+//------------------------------------------------------------------------------
+// Common stuff used also by lp_ticker and rtc_api (see "common_rtc.h").
+//
+#include "app_util_platform.h"
+
+bool              m_common_rtc_enabled = false;
+uint32_t volatile m_common_rtc_overflows = 0;
+bool     volatile lp_ticker_interrupt_fire = false;
+
+__STATIC_INLINE void rtc_ovf_event_check(void)
+{
+    if (nrf_rtc_event_pending(COMMON_RTC_INSTANCE, NRF_RTC_EVENT_OVERFLOW)) {
+        nrf_rtc_event_clear(COMMON_RTC_INSTANCE, NRF_RTC_EVENT_OVERFLOW);
+        /* Don't disable this event. It shall occur periodically.
+         * It is needed for RTC. */
+
+        ++m_common_rtc_overflows;
+    }
+}
+
+#if defined(TARGET_MCU_NRF51822)
+void common_rtc_irq_handler(void)
+#else
+void COMMON_RTC_IRQ_HANDLER(void)
+#endif
+{
+    rtc_ovf_event_check();
+
+#if DEVICE_LPTICKER
+    if (nrf_rtc_event_pending(COMMON_RTC_INSTANCE, LP_TICKER_EVENT) ||
+        lp_ticker_interrupt_fire) {
+
+        if (lp_ticker_interrupt_fire) {
+            lp_ticker_interrupt_fire = false;
+        }
+
+        lp_ticker_irq_handler();
+    }
+#endif
+}
+
+/* Function for fix errata 20: RTC Register values are invalid. */
+__STATIC_INLINE void errata_20(void)
+{
+#if defined(NRF52_ERRATA_20)
+    if (!softdevice_handler_is_enabled())
+    {
+        NRF_CLOCK->EVENTS_LFCLKSTARTED = 0;
+        NRF_CLOCK->TASKS_LFCLKSTART    = 1;
+
+        while (NRF_CLOCK->EVENTS_LFCLKSTARTED == 0)
+        {
+        }
+    }
+    NRF_RTC1->TASKS_STOP = 0;
+#endif
+}
+
+void RTC1_IRQHandler(void);
+
+void common_rtc_init(void)
+{
+    if (m_common_rtc_enabled) {
+#if DEVICE_LPTICKER
+        nrf_rtc_event_clear(COMMON_RTC_INSTANCE, LP_TICKER_EVENT);
+        nrf_rtc_int_disable(COMMON_RTC_INSTANCE, LP_TICKER_INT_MASK);
+#endif
+        return;
+    }
+
+    errata_20();
+
+    nrf_rtc_task_trigger(COMMON_RTC_INSTANCE, NRF_RTC_TASK_STOP);
+
+    NVIC_SetVector(RTC1_IRQn, (uint32_t)RTC1_IRQHandler);
+
+    /* RTC is driven by the low frequency (32.768 kHz) clock, a proper request
+     * must be made to have it running.
+     * Currently this clock is started in 'SystemInit' (see "system_nrf51.c"
+     * or "system_nrf52.c", respectively).
+     */
+
+    nrf_rtc_prescaler_set(COMMON_RTC_INSTANCE, 0);
+
+    /* Clear all RTC events. */
+#if defined(TARGET_MCU_NRF51822)
+    nrf_rtc_event_clear(COMMON_RTC_INSTANCE, OS_TICK_EVENT);
+#endif
+#if DEVICE_LPTICKER
+    nrf_rtc_event_clear(COMMON_RTC_INSTANCE, LP_TICKER_EVENT);
+#endif
+    nrf_rtc_event_clear(COMMON_RTC_INSTANCE, NRF_RTC_EVENT_OVERFLOW);
+
+    /* Disable all RTC events (According to NRF_51 Reference Manual
+     * RTC events can not be used to control RTC interrupts).
+     * IRQ signal to NVIC is provided if interrupt is enabled.
+     */
+
+    nrf_rtc_event_disable(COMMON_RTC_INSTANCE, NRF_RTC_INT_OVERFLOW_MASK
+#if defined(TARGET_MCU_NRF51822)
+        | OS_TICK_INT_MASK
+#endif
+#if DEVICE_LPTICKER
+        | LP_TICKER_INT_MASK
+#endif
+     );
+
+    /* This interrupt is enabled permanently, since overflow indications are needed
+     * continuously.
+     */
+    nrf_rtc_int_enable(COMMON_RTC_INSTANCE, NRF_RTC_INT_OVERFLOW_MASK);
+
+    /* Disable LP ticker interrupt for now. */
+#if DEVICE_LPTICKER
+    nrf_rtc_int_disable(COMMON_RTC_INSTANCE, LP_TICKER_INT_MASK);
+#endif
+
+    nrf_drv_common_irq_enable(nrf_drv_get_IRQn(COMMON_RTC_INSTANCE),
+#ifdef NRF51
+        APP_IRQ_PRIORITY_LOW
+#elif defined(NRF52) || defined(NRF52840_XXAA)
+        APP_IRQ_PRIORITY_LOWEST
+#endif
+        );
+
+    nrf_rtc_task_trigger(COMMON_RTC_INSTANCE, NRF_RTC_TASK_START);
+
+    m_common_rtc_enabled = true;
+}
+
+void common_rtc_set_interrupt(uint32_t ticks_count, uint32_t cc_channel,
+                              uint32_t int_mask)
+{
+    /* Set ticks value when interrupt should be fired.
+     * Interrupt scheduling is performed in upper layers. */
+
+    core_util_critical_section_enter();
+
+    /* COMPARE occurs when a CC register is N and the COUNTER value transitions from N-1 to N.
+     * If the COUNTER is N, writing N+2 to a CC register is guaranteed to trigger a
+     * COMPARE event at N+2.
+     */
+    const uint32_t now = nrf_rtc_counter_get(COMMON_RTC_INSTANCE);
+
+    if (now == ticks_count ||
+        RTC_WRAP(now + 1) == ticks_count) {
+        ticks_count += 2;
+    }
+
+    nrf_rtc_cc_set(COMMON_RTC_INSTANCE, cc_channel, RTC_WRAP(ticks_count));
+
+    if (!nrf_rtc_int_is_enabled(COMMON_RTC_INSTANCE, int_mask)) {
+        nrf_rtc_event_clear(COMMON_RTC_INSTANCE, LP_TICKER_EVENT);
+        nrf_rtc_int_enable(COMMON_RTC_INSTANCE, int_mask);
+    }
+
+    core_util_critical_section_exit();
+}
+
+/* Since there is no SysTick on NRF51, the RTC1 channel 0 is used as an
+ * alternative source of RTOS ticks.
+ */
+#if defined(TARGET_MCU_NRF51822)
+
+#include "mbed_toolchain.h"
+
+
+#define MAX_RTC_COUNTER_VAL     ((1uL << RTC_COUNTER_BITS) - 1)
+
+#ifndef RTC1_CONFIG_FREQUENCY
+    #define RTC1_CONFIG_FREQUENCY    32678 // [Hz]
+#endif
+
+
+
+void COMMON_RTC_IRQ_HANDLER(void)
+{
+    if(!nrf_rtc_event_pending(COMMON_RTC_INSTANCE, OS_TICK_EVENT)) {
+        common_rtc_irq_handler();
+    }
+}
+
+IRQn_Type mbed_get_m0_tick_irqn()
+{
+    return SWI3_IRQn;
+}
+
+
+#endif // defined(TARGET_MCU_NRF51822)
diff --git a/targets/TARGET_NORDIC/TARGET_NRF5/common_rtc.h b/targets/TARGET_NORDIC/TARGET_NRF5/common_rtc.h
index 2ebe70ecf72..dae27b263c4 100644
--- a/targets/TARGET_NORDIC/TARGET_NRF5/common_rtc.h
+++ b/targets/TARGET_NORDIC/TARGET_NRF5/common_rtc.h
@@ -20,29 +20,21 @@
 #include "nrf_rtc.h"
 
 #define RTC_COUNTER_BITS        24u
+#define RTC_FREQ                32768u
 
 // Instance 0 is reserved for SoftDevice.
-// Instance 1 is used as a common one for us_ticker, lp_ticker and (in case
+// Instance 1 is used as a common one for lp_ticker and (in case
 // of NRF51) as an alternative tick source for RTOS.
-// ["us_ticker.c" uses hard coded addresses of the 'NRF_RTC1->EVENT_COMPARE[1]'
-//  register in inline assembly implementations of COMMON_RTC_IRQ_HANDLER,
-//  please remember to update those in case of doing changes here]
 #define COMMON_RTC_INSTANCE     NRF_RTC1
 #define COMMON_RTC_IRQ_HANDLER  RTC1_IRQHandler
-#define US_TICKER_CC_CHANNEL    0
-#define OS_TICK_CC_CHANNEL      1
-#define LP_TICKER_CC_CHANNEL    2
-
-#define US_TICKER_SW_IRQ_MASK 0x1
-#define LP_TICKER_SW_IRQ_MASK 0x2
+#define OS_TICK_CC_CHANNEL      0
+#define LP_TICKER_CC_CHANNEL    1
 
 #define COMMON_RTC_EVENT_COMPARE(channel) \
     CONCAT_2(NRF_RTC_EVENT_COMPARE_, channel)
 #define COMMON_RTC_INT_COMPARE_MASK(channel) \
     CONCAT_3(NRF_RTC_INT_COMPARE, channel, _MASK)
 
-#define US_TICKER_EVENT     COMMON_RTC_EVENT_COMPARE(US_TICKER_CC_CHANNEL)
-#define US_TICKER_INT_MASK  COMMON_RTC_INT_COMPARE_MASK(US_TICKER_CC_CHANNEL)
 #define OS_TICK_EVENT       COMMON_RTC_EVENT_COMPARE(OS_TICK_CC_CHANNEL)
 #define OS_TICK_INT_MASK    COMMON_RTC_INT_COMPARE_MASK(OS_TICK_CC_CHANNEL)
 #define LP_TICKER_EVENT     COMMON_RTC_EVENT_COMPARE(LP_TICKER_CC_CHANNEL)
@@ -50,7 +42,7 @@
 
 extern bool              m_common_rtc_enabled;
 extern uint32_t volatile m_common_rtc_overflows;
-extern uint8_t volatile m_common_sw_irq_flag; 
+extern bool volatile     lp_ticker_interrupt_fire;
 
 void     common_rtc_init(void);
 uint32_t common_rtc_32bit_ticks_get(void);
diff --git a/targets/TARGET_NORDIC/TARGET_NRF5/lp_ticker.c b/targets/TARGET_NORDIC/TARGET_NRF5/lp_ticker.c
index a6d8bd0db17..9e197d8555e 100644
--- a/targets/TARGET_NORDIC/TARGET_NRF5/lp_ticker.c
+++ b/targets/TARGET_NORDIC/TARGET_NRF5/lp_ticker.c
@@ -14,11 +14,20 @@
  * limitations under the License.
  */
 #include "lp_ticker_api.h"
+#include "common_rtc.h"
+#include "platform/mbed_critical.h"
 
 #if DEVICE_LPTICKER
 
-#include "common_rtc.h"
-#include "mbed_critical.h"
+/* LP ticker is driven by 32kHz clock and counter length is 24 bits. */
+const ticker_info_t* lp_ticker_get_info()
+{
+    static const ticker_info_t info = {
+        RTC_FREQ,
+        RTC_COUNTER_BITS
+    };
+    return &info;
+}
 
 void lp_ticker_init(void)
 {
@@ -33,7 +42,7 @@ void lp_ticker_free(void)
 
 uint32_t lp_ticker_read()
 {
-    return (uint32_t)common_rtc_64bit_us_get();
+    return nrf_rtc_counter_get(COMMON_RTC_INSTANCE);
 }
 
 void lp_ticker_set_interrupt(timestamp_t timestamp)
@@ -45,14 +54,17 @@ void lp_ticker_set_interrupt(timestamp_t timestamp)
 void lp_ticker_fire_interrupt(void)
 {
     core_util_critical_section_enter();
-    m_common_sw_irq_flag |= LP_TICKER_SW_IRQ_MASK;
+
+    lp_ticker_interrupt_fire = true;
+
     NVIC_SetPendingIRQ(RTC1_IRQn);
+
     core_util_critical_section_exit();
 }
 
 void lp_ticker_disable_interrupt(void)
 {
-    nrf_rtc_event_disable(COMMON_RTC_INSTANCE, LP_TICKER_INT_MASK);
+    nrf_rtc_int_disable(COMMON_RTC_INSTANCE, LP_TICKER_INT_MASK);
 }
 
 void lp_ticker_clear_interrupt(void)
diff --git a/targets/TARGET_NORDIC/TARGET_NRF5/us_ticker.c b/targets/TARGET_NORDIC/TARGET_NRF5/us_ticker.c
index a341ae2d76f..11e2805b3aa 100644
--- a/targets/TARGET_NORDIC/TARGET_NRF5/us_ticker.c
+++ b/targets/TARGET_NORDIC/TARGET_NRF5/us_ticker.c
@@ -37,131 +37,55 @@
  */
 
 #include "us_ticker_api.h"
-#include "common_rtc.h"
-#include "app_util.h"
+#include "nrf_timer.h"
+#include "app_util_platform.h"
 #include "nrf_drv_common.h"
-#include "lp_ticker_api.h"
 #include "mbed_critical.h"
+#include "us_ticker.h"
 
-#if defined(NRF52_ERRATA_20)
-    #include "softdevice_handler.h"
-#endif
-
-//------------------------------------------------------------------------------
-// Common stuff used also by lp_ticker and rtc_api (see "common_rtc.h").
-//
-#include "app_util_platform.h"
-
-bool              m_common_rtc_enabled = false;
-uint32_t volatile m_common_rtc_overflows = 0;
-
-// lp/us ticker fire interrupt flag for IRQ handler
-volatile uint8_t m_common_sw_irq_flag = 0; 
+static bool us_ticker_initialized = false;
 
-__STATIC_INLINE void rtc_ovf_event_check(void)
+/* us ticker is driven by 1MHz clock and counter length is 16 bits. */
+const ticker_info_t* us_ticker_get_info()
 {
-    if (nrf_rtc_event_pending(COMMON_RTC_INSTANCE, NRF_RTC_EVENT_OVERFLOW)) {
-        nrf_rtc_event_clear(COMMON_RTC_INSTANCE, NRF_RTC_EVENT_OVERFLOW);
-        // Don't disable this event. It shall occur periodically.
-
-        ++m_common_rtc_overflows;
-    }
+    static const ticker_info_t info = {
+        US_TICKER_FREQ,
+        US_TICKER_COUNTER_BITS
+    };
+    return &info;
 }
 
-#if defined(TARGET_MCU_NRF51822)
-void common_rtc_irq_handler(void)
-#else
-void COMMON_RTC_IRQ_HANDLER(void)
-#endif
+void us_ticker_init(void)
 {
-
-    rtc_ovf_event_check();
-
-    if ((m_common_sw_irq_flag & US_TICKER_SW_IRQ_MASK) || nrf_rtc_event_pending(COMMON_RTC_INSTANCE, US_TICKER_EVENT)) {
-        us_ticker_irq_handler();
-    }
-
-#if DEVICE_LPTICKER
-    if (m_common_sw_irq_flag & LP_TICKER_SW_IRQ_MASK) {
-        m_common_sw_irq_flag &= ~LP_TICKER_SW_IRQ_MASK;
-        lp_ticker_irq_handler();
+    if (us_ticker_initialized) {
+        nrf_timer_event_clear(NRF_TIMER1, NRF_TIMER_EVENT_COMPARE0);
+        nrf_timer_int_disable(NRF_TIMER1, nrf_timer_compare_int_get(NRF_TIMER_CC_CHANNEL0));
+        return;
     }
-    if (nrf_rtc_event_pending(COMMON_RTC_INSTANCE, LP_TICKER_EVENT)) {
 
-        lp_ticker_irq_handler();
-    }
-#endif
-}
-
-// Function for fix errata 20: RTC Register values are invalid
-__STATIC_INLINE void errata_20(void)
-{
-#if defined(NRF52_ERRATA_20)
-    if (!softdevice_handler_is_enabled())
-    {
-        NRF_CLOCK->EVENTS_LFCLKSTARTED = 0;
-        NRF_CLOCK->TASKS_LFCLKSTART    = 1;
-
-        while (NRF_CLOCK->EVENTS_LFCLKSTARTED == 0)
-        {
-        }
-    }
-    NRF_RTC1->TASKS_STOP = 0;
-#endif
-}
+    nrf_timer_task_trigger(NRF_TIMER1, NRF_TIMER_TASK_STOP);
 
-void RTC1_IRQHandler(void);
+    nrf_timer_int_disable(NRF_TIMER1, nrf_timer_compare_int_get(NRF_TIMER_CC_CHANNEL0));
 
-void common_rtc_init(void)
-{
-    if (m_common_rtc_enabled) {
-        return;
-    }
+    /* Configure timer as follows:
+     * - timer mode,
+     * - timer width 16 bits,
+     * - timer freq 1 MHz.
+     */
+    nrf_timer_mode_set(NRF_TIMER1, NRF_TIMER_MODE_TIMER);
 
-    errata_20();
+    nrf_timer_frequency_set(NRF_TIMER1, NRF_TIMER_FREQ_1MHz);
 
-    NVIC_SetVector(RTC1_IRQn, (uint32_t)RTC1_IRQHandler);
-    
-    // RTC is driven by the low frequency (32.768 kHz) clock, a proper request
-    // must be made to have it running.
-    // Currently this clock is started in 'SystemInit' (see "system_nrf51.c"
-    // or "system_nrf52.c", respectively).
+    nrf_timer_bit_width_set(NRF_TIMER1, NRF_TIMER_BIT_WIDTH_16);
 
-    nrf_rtc_prescaler_set(COMMON_RTC_INSTANCE, 0);
+    nrf_timer_cc_write(NRF_TIMER1, NRF_TIMER_CC_CHANNEL0, 0);
 
-    nrf_rtc_event_clear(COMMON_RTC_INSTANCE, US_TICKER_EVENT);
-#if defined(TARGET_MCU_NRF51822)
-    nrf_rtc_event_clear(COMMON_RTC_INSTANCE, OS_TICK_EVENT);
-#endif
-#if DEVICE_LPTICKER
-    nrf_rtc_event_clear(COMMON_RTC_INSTANCE, LP_TICKER_EVENT);
-#endif
-    nrf_rtc_event_clear(COMMON_RTC_INSTANCE, NRF_RTC_EVENT_OVERFLOW);
+    nrf_timer_event_clear(NRF_TIMER1, NRF_TIMER_EVENT_COMPARE0);
 
-    // Interrupts on all related events are enabled permanently. Particular
-    // events will be enabled or disabled as needed (such approach is more
-    // energy efficient).
-    nrf_rtc_int_enable(COMMON_RTC_INSTANCE,
-#if DEVICE_LPTICKER
-        LP_TICKER_INT_MASK |
-#endif
-        US_TICKER_INT_MASK |
-        NRF_RTC_INT_OVERFLOW_MASK);
+    NVIC_SetVector(TIMER1_IRQn, (uint32_t)us_ticker_irq_handler);
 
-    // This event is enabled permanently, since overflow indications are needed
-    // continuously.
-    nrf_rtc_event_enable(COMMON_RTC_INSTANCE, NRF_RTC_INT_OVERFLOW_MASK);
-    // All other relevant events are initially disabled.
-    nrf_rtc_event_disable(COMMON_RTC_INSTANCE,
-#if defined(TARGET_MCU_NRF51822)
-        OS_TICK_INT_MASK |
-#endif
-#if DEVICE_LPTICKER
-        LP_TICKER_INT_MASK |
-#endif
-        US_TICKER_INT_MASK);
+    nrf_drv_common_irq_enable(TIMER1_IRQn,
 
-    nrf_drv_common_irq_enable(nrf_drv_get_IRQn(COMMON_RTC_INSTANCE),
 #ifdef NRF51
         APP_IRQ_PRIORITY_LOW
 #elif defined(NRF52) || defined(NRF52840_XXAA)
@@ -169,167 +93,49 @@ void common_rtc_init(void)
 #endif
         );
 
-    nrf_rtc_task_trigger(COMMON_RTC_INSTANCE, NRF_RTC_TASK_START);
+    nrf_timer_task_trigger(NRF_TIMER1, NRF_TIMER_TASK_START);
 
-    m_common_rtc_enabled = true;
+    us_ticker_initialized = true;
 }
 
-__STATIC_INLINE void rtc_ovf_event_safe_check(void)
-{
-    core_util_critical_section_enter();
-
-    rtc_ovf_event_check();
-
-    core_util_critical_section_exit();
-}
-
-
-uint32_t common_rtc_32bit_ticks_get(void)
+uint32_t us_ticker_read()
 {
-    uint32_t ticks;
-    uint32_t prev_overflows;
-
-    do {
-        prev_overflows = m_common_rtc_overflows;
-
-        ticks = nrf_rtc_counter_get(COMMON_RTC_INSTANCE);
-        // The counter used for time measurements is less than 32 bit wide,
-        // so its value is complemented with the number of registered overflows
-        // of the counter.
-        ticks += (m_common_rtc_overflows << RTC_COUNTER_BITS);
-
-        // Check in case that OVF occurred during execution of a RTC handler (apply if call was from RTC handler)
-        // m_common_rtc_overflows might been updated in this call.
-        rtc_ovf_event_safe_check();
-
-        // If call was made from a low priority level m_common_rtc_overflows might have been updated in RTC handler.
-    } while (m_common_rtc_overflows != prev_overflows);
-
-    return ticks;
-}
+    nrf_timer_task_trigger(NRF_TIMER1, NRF_TIMER_TASK_CAPTURE1);
 
-uint64_t common_rtc_64bit_us_get(void)
-{
-    uint32_t ticks = common_rtc_32bit_ticks_get();
-    // [ticks -> microseconds]
-    return ROUNDED_DIV(((uint64_t)ticks) * 1000000, RTC_INPUT_FREQ);
+    return nrf_timer_cc_read(NRF_TIMER1, NRF_TIMER_CC_CHANNEL1);
 }
 
-void common_rtc_set_interrupt(uint32_t us_timestamp, uint32_t cc_channel,
-                              uint32_t int_mask)
+void us_ticker_set_interrupt(timestamp_t timestamp)
 {
-    // The internal counter is clocked with a frequency that cannot be easily
-    // multiplied to 1 MHz, therefore besides the translation of values
-    // (microsecond <-> ticks) a special care of overflows handling must be
-    // taken. Here the 32-bit timestamp value is complemented with information
-    // about current the system up time of (ticks + number of overflows of tick
-    // counter on upper bits, converted to microseconds), and such 64-bit value
-    // is then translated to counter ticks. Finally, the lower 24 bits of thus
-    // calculated value is written to the counter compare register to prepare
-    // the interrupt generation.
-    uint64_t current_time64 = common_rtc_64bit_us_get();
-    // [add upper 32 bits from the current time to the timestamp value]
-    uint64_t timestamp64 = us_timestamp +
-        (current_time64 & ~(uint64_t)0xFFFFFFFF);
-    // [if the original timestamp value happens to be after the 32 bit counter
-    //  of microsends overflows, correct the upper 32 bits accordingly]
-    if (us_timestamp < (uint32_t)(current_time64 & 0xFFFFFFFF)) {
-        timestamp64 += ((uint64_t)1 << 32);
-    }
-    // [microseconds -> ticks, always round the result up to avoid too early
-    //  interrupt generation]
-    uint32_t compare_value =
-        (uint32_t)CEIL_DIV((timestamp64) * RTC_INPUT_FREQ, 1000000);
+    core_util_critical_section_enter();
 
+    nrf_timer_cc_write(NRF_TIMER1, NRF_TIMER_CC_CHANNEL0, timestamp & 0xFFFF);
 
-    core_util_critical_section_enter();
-    // The COMPARE event occurs when the value in compare register is N and
-    // the counter value changes from N-1 to N. Therefore, the minimal safe
-    // difference between the compare value to be set and the current counter
-    // value is 2 ticks. This guarantees that the compare trigger is properly
-    // setup before the compare condition occurs.
-    uint32_t closest_safe_compare = common_rtc_32bit_ticks_get() + 2;
-    if ((int)(compare_value - closest_safe_compare) <= 0) {
-        compare_value = closest_safe_compare;
+    if (!nrf_timer_int_enable_check(NRF_TIMER1, nrf_timer_compare_int_get(NRF_TIMER_CC_CHANNEL0))) {
+        nrf_timer_event_clear(NRF_TIMER1, NRF_TIMER_EVENT_COMPARE0);
+        nrf_timer_int_enable(NRF_TIMER1, nrf_timer_compare_int_get(NRF_TIMER_CC_CHANNEL0));
     }
 
-    nrf_rtc_cc_set(COMMON_RTC_INSTANCE, cc_channel, RTC_WRAP(compare_value));
-    nrf_rtc_event_enable(COMMON_RTC_INSTANCE, int_mask);
-
     core_util_critical_section_exit();
 }
-//------------------------------------------------------------------------------
-
-
-void us_ticker_init(void)
-{
-    common_rtc_init();
-}
-
-void us_ticker_free(void)
-{
-    // A common counter is used for RTC, lp_ticker and us_ticker, so it can't be
-    // disabled here, but this does not cause any extra cost.
-}
-
-uint32_t us_ticker_read()
-{
-    us_ticker_init();
-    return (uint32_t)common_rtc_64bit_us_get();
-}
-
-void us_ticker_set_interrupt(timestamp_t timestamp)
-{
-    common_rtc_set_interrupt(timestamp,
-        US_TICKER_CC_CHANNEL, US_TICKER_INT_MASK);
-}
 
 void us_ticker_fire_interrupt(void)
 {
-    core_util_critical_section_enter();
-    m_common_sw_irq_flag |= US_TICKER_SW_IRQ_MASK;
-    NVIC_SetPendingIRQ(RTC1_IRQn);
-    core_util_critical_section_exit();
+    NVIC_SetPendingIRQ(TIMER1_IRQn);
 }
 
 void us_ticker_disable_interrupt(void)
 {
-    nrf_rtc_event_disable(COMMON_RTC_INSTANCE, US_TICKER_INT_MASK);
+    nrf_timer_int_disable(NRF_TIMER1, nrf_timer_compare_int_get(NRF_TIMER_CC_CHANNEL0));
 }
 
 void us_ticker_clear_interrupt(void)
 {
-    m_common_sw_irq_flag &= ~US_TICKER_SW_IRQ_MASK;
-    nrf_rtc_event_clear(COMMON_RTC_INSTANCE, US_TICKER_EVENT);
+    nrf_timer_event_clear(NRF_TIMER1, NRF_TIMER_EVENT_COMPARE0);
 }
 
-
-// Since there is no SysTick on NRF51, the RTC1 channel 1 is used as an
-// alternative source of RTOS ticks.
-#if defined(TARGET_MCU_NRF51822)
-
-#include "mbed_toolchain.h"
-
-
-#define MAX_RTC_COUNTER_VAL     ((1uL << RTC_COUNTER_BITS) - 1)
-
-#ifndef RTC1_CONFIG_FREQUENCY
-    #define RTC1_CONFIG_FREQUENCY    32678 // [Hz]
-#endif
-
-
-
-void COMMON_RTC_IRQ_HANDLER(void)
-{
-    if(!nrf_rtc_event_pending(COMMON_RTC_INSTANCE, OS_TICK_EVENT)) {
-        common_rtc_irq_handler();
-    }
-}
-
-IRQn_Type mbed_get_m0_tick_irqn()
+void us_ticker_free(void)
 {
-    return SWI3_IRQn;
+    // A common counter is used for RTC, lp_ticker and us_ticker, so it can't be
+    // disabled here, but this does not cause any extra cost.
 }
-
-
-#endif // defined(TARGET_MCU_NRF51822)
diff --git a/targets/TARGET_NORDIC/TARGET_NRF5/us_ticker.h b/targets/TARGET_NORDIC/TARGET_NRF5/us_ticker.h
new file mode 100644
index 00000000000..f9bf80424c6
--- /dev/null
+++ b/targets/TARGET_NORDIC/TARGET_NRF5/us_ticker.h
@@ -0,0 +1,26 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2018 ARM Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef US_TICKER_H
+#define US_TICKER_H
+
+/* TIMER0 is reserved for SoftDevice. We will use TIMER1 for us ticker
+ * which counter size is 16 bits. */
+
+#define US_TICKER_COUNTER_BITS        16u
+#define US_TICKER_FREQ                1000000
+
+#endif // US_TICKER_H
diff --git a/targets/targets.json b/targets/targets.json
index 93cf4c4c550..ec4edd635ff 100755
--- a/targets/targets.json
+++ b/targets/targets.json
@@ -3431,7 +3431,8 @@
             "TARGET_MCU_NRF51822",
             "CMSIS_VECTAB_VIRTUAL",
             "CMSIS_VECTAB_VIRTUAL_HEADER_FILE=\"cmsis_nvic.h\"",
-            "NO_SYSTICK"
+            "NO_SYSTICK",
+            "MBED_TICKLESS"
         ],
         "MERGE_BOOTLOADER": false,
         "extra_labels": ["NORDIC", "MCU_NRF51", "MCU_NRF51822_UNIFIED", "NRF5", "SDK11"],
@@ -3476,8 +3477,8 @@
     "NRF51_DK": {
         "supported_form_factors": ["ARDUINO"],
         "inherits": ["MCU_NRF51_32K_UNIFIED"],
-        "device_has": ["ANALOGIN", "I2C", "I2C_ASYNCH", "INTERRUPTIN", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "RTC", "SERIAL", "SERIAL_ASYNCH", "SERIAL_FC", "SLEEP", "SPI", "SPI_ASYNCH", "SPISLAVE"],
-        "release_versions": ["2"],
+        "device_has": ["USTICKER", "LPTICKER", "ANALOGIN", "I2C", "I2C_ASYNCH", "INTERRUPTIN", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "RTC", "SERIAL", "SERIAL_ASYNCH", "SERIAL_FC", "SLEEP", "SPI", "SPI_ASYNCH", "SPISLAVE"],
+        "release_versions": ["2", "5"],
         "device_name": "nRF51822_xxAA"
     },
     "NRF51_DONGLE": {