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diff --git a/src/sample/io_sample/RTC/Overflow/main.c b/src/sample/io_sample/RTC/Overflow/main.c
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+++ b/src/sample/io_sample/RTC/Overflow/main.c
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+/**
+*********************************************************************************************************
+*               Copyright(c) 2018, Realtek Semiconductor Corporation. All rights reserved.
+**********************************************************************************************************
+* @file     main.c
+* @brief    This file provides demo code to realize RTC Overflow function.
+            RTC is a 32-bit counter.
+* @details
+* @author   yuan
+* @date     2018-05-25
+* @version  v1.0
+*********************************************************************************************************
+*/
+
+/* Defines ------------------------------------------------------------------*/
+/** Prescaler value.
+  * 12 bits prescaler for COUNTER frequency (32768/(PRESCALER+1)).
+  * If use internal 32KHz, (32000/(PRESCALER+1)).
+  * Must be written when RTC 32-bit counter is stopped.
+  */
+#define RTC_PRESCALER_VALUE     0   //f = (1/32000)Hz
+
+/* Includes ------------------------------------------------------------------*/
+#include <stdlib.h>
+#include "rtl876x_rcc.h"
+#include "rtl876x_rtc.h"
+#include "rtl876x_nvic.h"
+#include "trace.h"
+
+/**
+  * @brief  Initialize rtc peripheral.
+  * @param   No parameter.
+  * @return  void
+  */
+void driver_rtc_init(void)
+{
+    RTC_DeInit();
+    RTC_SetPrescaler(RTC_PRESCALER_VALUE);
+
+    /* Config RTC interrupt */
+    NVIC_InitTypeDef NVIC_InitStruct;
+    NVIC_InitStruct.NVIC_IRQChannel = RTC_IRQn;
+    NVIC_InitStruct.NVIC_IRQChannelPriority = 2;
+    NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE;
+    NVIC_Init(&NVIC_InitStruct);
+
+    RTC_NvCmd(ENABLE);
+    /* Start RTC */
+    RTC_ResetCounter();
+    RTC_Cmd(ENABLE);
+}
+
+/**
+  * @brief  Demo code of operation about RTC.
+  * @param  No parameter.
+  * @return void
+  */
+void rtc_demo(void)
+{
+    /* Initialize RTC peripheral */
+    driver_rtc_init();
+    //Add application code here
+}
+
+/**
+  * @brief    Entry of app code
+  * @return   int (To avoid compile warning)
+  */
+int main(void)
+{
+    extern uint32_t random_seed_value;
+    srand(random_seed_value);
+    __enable_irq();
+
+    rtc_demo();
+
+    while (1)
+    {
+        __nop();
+        __nop();
+        __nop();
+        __nop();
+        __nop();
+        __nop();
+
+    }
+}
+
+/**
+  * @brief  RTC interrupt handle function.
+  * @param  None.
+  * @return None.
+  */
+void RTC_Handler(void)
+{
+    /* RTC overflow interrupt handle */
+    if (RTC_GetINTStatus(RTC_INT_OVF) == SET)
+    {
+        /* Notes: DBG_DIRECT function is only used for debugging demonstrations, not for application projects.*/
+        DBG_DIRECT("[main]RTC_Handler: RTC_INT_OVF");
+        // Add application code here
+        RTC_ClearOverFlowINT();
+    }
+}
+
+/******************* (C) COPYRIGHT 2016 Realtek Semiconductor Corporation *****END OF FILE****/
+