diff --git a/targets/TARGET_NUVOTON/TARGET_M451/lp_ticker.c b/targets/TARGET_NUVOTON/TARGET_M451/lp_ticker.c
index 0ae86455d8..a26884036e 100644
--- a/targets/TARGET_NUVOTON/TARGET_M451/lp_ticker.c
+++ b/targets/TARGET_NUVOTON/TARGET_M451/lp_ticker.c
@@ -115,10 +115,7 @@ void lp_ticker_set_interrupt(timestamp_t timestamp)
     uint32_t cmp_timer = timestamp * NU_TMRCLK_PER_TICK;
     cmp_timer = NU_CLAMP(cmp_timer, TMR_CMP_MIN, TMR_CMP_MAX);
     timer_base->CMP = cmp_timer;
-
-    /* NOTE: When engine is clocked by low power clock source (LXT/LIRC), we need to wait for 3 engine clocks. */
     wait_us((NU_US_PER_SEC / NU_TMRCLK_PER_SEC) * 3);
-    TIMER_Start(timer_base);
 }
 
 void lp_ticker_disable_interrupt(void)
diff --git a/targets/TARGET_NUVOTON/TARGET_M480/lp_ticker.c b/targets/TARGET_NUVOTON/TARGET_M480/lp_ticker.c
index e1f71f59c3..b90cdeac33 100644
--- a/targets/TARGET_NUVOTON/TARGET_M480/lp_ticker.c
+++ b/targets/TARGET_NUVOTON/TARGET_M480/lp_ticker.c
@@ -115,10 +115,7 @@ void lp_ticker_set_interrupt(timestamp_t timestamp)
     uint32_t cmp_timer = timestamp * NU_TMRCLK_PER_TICK;
     cmp_timer = NU_CLAMP(cmp_timer, TMR_CMP_MIN, TMR_CMP_MAX);
     timer_base->CMP = cmp_timer;
-
-    /* NOTE: When engine is clocked by low power clock source (LXT/LIRC), we need to wait for 3 engine clocks. */
     wait_us((NU_US_PER_SEC / NU_TMRCLK_PER_SEC) * 3);
-    TIMER_Start(timer_base);
 }
 
 void lp_ticker_disable_interrupt(void)
diff --git a/targets/TARGET_NUVOTON/TARGET_NANO100/lp_ticker.c b/targets/TARGET_NUVOTON/TARGET_NANO100/lp_ticker.c
index 1650821176..d084316e41 100644
--- a/targets/TARGET_NUVOTON/TARGET_NANO100/lp_ticker.c
+++ b/targets/TARGET_NUVOTON/TARGET_NANO100/lp_ticker.c
@@ -117,10 +117,7 @@ void lp_ticker_set_interrupt(timestamp_t timestamp)
     uint32_t cmp_timer = timestamp * NU_TMRCLK_PER_TICK;
     cmp_timer = NU_CLAMP(cmp_timer, TMR_CMP_MIN, TMR_CMP_MAX);
     timer_base->CMPR = cmp_timer;
-
-    /* NOTE: When engine is clocked by low power clock source (LXT/LIRC), we need to wait for 3 engine clocks. */
     wait_us((NU_US_PER_SEC / NU_TMRCLK_PER_SEC) * 3);
-    TIMER_Start(timer_base);
 }
 
 void lp_ticker_disable_interrupt(void)
diff --git a/targets/TARGET_NUVOTON/TARGET_NUC472/lp_ticker.c b/targets/TARGET_NUVOTON/TARGET_NUC472/lp_ticker.c
index 6c4aa88193..f017137099 100644
--- a/targets/TARGET_NUVOTON/TARGET_NUC472/lp_ticker.c
+++ b/targets/TARGET_NUVOTON/TARGET_NUC472/lp_ticker.c
@@ -114,10 +114,7 @@ void lp_ticker_set_interrupt(timestamp_t timestamp)
     uint32_t cmp_timer = timestamp * NU_TMRCLK_PER_TICK;
     cmp_timer = NU_CLAMP(cmp_timer, TMR_CMP_MIN, TMR_CMP_MAX);
     timer_base->CMP = cmp_timer;
-
-    /* NOTE: When engine is clocked by low power clock source (LXT/LIRC), we need to wait for 3 engine clocks. */
     wait_us((NU_US_PER_SEC / NU_TMRCLK_PER_SEC) * 3);
-    TIMER_Start(timer_base);
 }
 
 void lp_ticker_disable_interrupt(void)