diff --git a/bsp/stm32/libraries/HAL_Drivers/drv_rtc.c b/bsp/stm32/libraries/HAL_Drivers/drv_rtc.c
index b96d9aa524..136ab93d62 100644
--- a/bsp/stm32/libraries/HAL_Drivers/drv_rtc.c
+++ b/bsp/stm32/libraries/HAL_Drivers/drv_rtc.c
@@ -68,11 +68,11 @@ static rt_err_t set_rtc_time_stamp(time_t time_stamp)
     RTC_DateStruct.Year    = p_tm->tm_year - 100;
     RTC_DateStruct.WeekDay = p_tm->tm_wday + 1;
 
-    if(HAL_RTC_SetTime(&RTC_Handler, &RTC_TimeStruct, RTC_FORMAT_BIN) != HAL_OK)
+    if (HAL_RTC_SetTime(&RTC_Handler, &RTC_TimeStruct, RTC_FORMAT_BIN) != HAL_OK)
     {
         return -RT_ERROR;
     }
-    if(HAL_RTC_SetDate(&RTC_Handler, &RTC_DateStruct, RTC_FORMAT_BIN) != HAL_OK)
+    if (HAL_RTC_SetDate(&RTC_Handler, &RTC_DateStruct, RTC_FORMAT_BIN) != HAL_OK)
     {
         return -RT_ERROR;
     }
@@ -87,9 +87,17 @@ static void rt_rtc_init(void)
     __HAL_RCC_PWR_CLK_ENABLE();
 
     RCC_OscInitTypeDef RCC_OscInitStruct = {0};
+#ifdef BSP_RTC_USING_LSI
+    RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSI;
+    RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
+    RCC_OscInitStruct.LSEState = RCC_LSE_OFF;
+    RCC_OscInitStruct.LSIState = RCC_LSI_ON;
+#else
     RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSE;
     RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
     RCC_OscInitStruct.LSEState = RCC_LSE_ON;
+    RCC_OscInitStruct.LSIState = RCC_LSI_OFF;
+#endif
     HAL_RCC_OscConfig(&RCC_OscInitStruct);
 }
 
@@ -99,7 +107,11 @@ static rt_err_t rt_rtc_config(struct rt_device *dev)
 
     HAL_PWR_EnableBkUpAccess();
     PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_RTC;
+#ifdef BSP_RTC_USING_LSI
+    PeriphClkInitStruct.RTCClockSelection = RCC_RTCCLKSOURCE_LSI;
+#else
     PeriphClkInitStruct.RTCClockSelection = RCC_RTCCLKSOURCE_LSE;
+#endif
     HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct);
 
     RTC_Handler.Instance = RTC;
@@ -110,13 +122,31 @@ static rt_err_t rt_rtc_config(struct rt_device *dev)
 #if defined(SOC_SERIES_STM32F1)
         RTC_Handler.Init.OutPut = RTC_OUTPUTSOURCE_NONE;
         RTC_Handler.Init.AsynchPrediv = RTC_AUTO_1_SECOND;
-#elif defined(SOC_SERIES_STM32F0) || defined(SOC_SERIES_STM32F4) || defined(SOC_SERIES_STM32F7) || defined(SOC_SERIES_STM32L4)
-        RTC_Handler.Init.AsynchPrediv = 0X7F;
-#ifndef SOC_SERIES_STM32F0
-        RTC_Handler.Init.SynchPrediv = 0XFF;
+#elif defined(SOC_SERIES_STM32F0)
+
+        /* set the frequency division */
+#ifdef BSP_RTC_USING_LSI
+        RTC_Handler.Init.AsynchPrediv = 0XA0;
+        RTC_Handler.Init.SynchPrediv = 0xFA;
 #else
+        RTC_Handler.Init.AsynchPrediv = 0X7F;
         RTC_Handler.Init.SynchPrediv = 0x0130;
-#endif
+#endif /* BSP_RTC_USING_LSI */
+
+        RTC_Handler.Init.HourFormat = RTC_HOURFORMAT_24;
+        RTC_Handler.Init.OutPut = RTC_OUTPUT_DISABLE;
+        RTC_Handler.Init.OutPutPolarity = RTC_OUTPUT_POLARITY_HIGH;
+        RTC_Handler.Init.OutPutType = RTC_OUTPUT_TYPE_OPENDRAIN;
+#elif defined(SOC_SERIES_STM32F4) || defined(SOC_SERIES_STM32F7) || defined(SOC_SERIES_STM32L4)
+
+        /* set the frequency division */
+#ifdef BSP_RTC_USING_LSI
+        RTC_Handler.Init.AsynchPrediv = 0X7D;
+#else
+        RTC_Handler.Init.AsynchPrediv = 0X7F;
+#endif /* BSP_RTC_USING_LSI */
+        RTC_Handler.Init.SynchPrediv = 0XFF;
+
         RTC_Handler.Init.HourFormat = RTC_HOURFORMAT_24;
         RTC_Handler.Init.OutPut = RTC_OUTPUT_DISABLE;
         RTC_Handler.Init.OutPutPolarity = RTC_OUTPUT_POLARITY_HIGH;
@@ -142,7 +172,7 @@ static rt_err_t rt_rtc_control(rt_device_t dev, int cmd, void *args)
         break;
 
     case RT_DEVICE_CTRL_RTC_SET_TIME:
-        if(set_rtc_time_stamp(*(rt_uint32_t *)args))
+        if (set_rtc_time_stamp(*(rt_uint32_t *)args))
         {
             result = -RT_ERROR;
         }
@@ -154,7 +184,7 @@ static rt_err_t rt_rtc_control(rt_device_t dev, int cmd, void *args)
 }
 
 #ifdef RT_USING_DEVICE_OPS
-const static struct rt_device_ops rtc_ops = 
+const static struct rt_device_ops rtc_ops =
 {
     RT_NULL,
     RT_NULL,
diff --git a/bsp/stm32/stm32f091-st-nucleo/README.md b/bsp/stm32/stm32f091-st-nucleo/README.md
index 397dcfb9e7..5165ed6f85 100644
--- a/bsp/stm32/stm32f091-st-nucleo/README.md
+++ b/bsp/stm32/stm32f091-st-nucleo/README.md
@@ -46,7 +46,7 @@ STM32F091RC-NuCLEO 开发板是 ST 官方推出的一款基于 ARM Cortex-M0 内
 | I2C | 支持 |  |
 | TIMER     |     支持     |                               |
 | ADC | 支持 |  |
-| RTC               |   支持   |                               |
+| RTC               |   支持   | 支持外部晶振和内部低速时钟 |
 | PWM               |   支持   |                               |
 | FLASH | 支持 |  |
 | IWG               |   支持   |                               |
diff --git a/bsp/stm32/stm32f091-st-nucleo/board/Kconfig b/bsp/stm32/stm32f091-st-nucleo/board/Kconfig
index 4fe2365ebc..b1cb41d203 100644
--- a/bsp/stm32/stm32f091-st-nucleo/board/Kconfig
+++ b/bsp/stm32/stm32f091-st-nucleo/board/Kconfig
@@ -133,11 +133,23 @@ menu "On-chip Peripheral Drivers"
         bool "Enable on-chip FLASH"
         default n 
 
-    config BSP_USING_ONCHIP_RTC
+    menuconfig BSP_USING_ONCHIP_RTC
         bool "Enable RTC"
         select RT_USING_RTC
         select RT_USING_LIBC
         default n
+        if BSP_USING_ONCHIP_RTC
+            choice
+                prompt "Select clock source"
+                default BSP_RTC_USING_LSE
+
+                config BSP_RTC_USING_LSE
+                    bool "RTC USING LSE"
+
+                config BSP_RTC_USING_LSI
+                    bool "RTC USING LSI"
+            endchoice
+        endif
 
     config BSP_USING_WDT
         bool "Enable Watchdog Timer"
diff --git a/bsp/stm32/stm32f103-atk-nano/README.md b/bsp/stm32/stm32f103-atk-nano/README.md
index e3cac7bd62..827f67ac0c 100644
--- a/bsp/stm32/stm32f103-atk-nano/README.md
+++ b/bsp/stm32/stm32f103-atk-nano/README.md
@@ -46,7 +46,7 @@ ATK-NANO STM32F103 是正点原子推出的一款基于 ARM Cortex-M3 内核的
 | UART              |     支持     | UART1/2/3                             |
 | SPI               |     支持     | SPI1/2                              |
 | I2C               |     支持     | 软件 I2C                              |
-| RTC               |     支持     |                                       |
+| RTC               |     支持     | 支持外部晶振和内部低速时钟 |
 | WDT               |     支持     |                                       |
 | ADC               |     支持     |                                       |
 | FLASH | 支持 | 已适配 [FAL](https://github.com/RT-Thread-packages/fal) |
diff --git a/bsp/stm32/stm32f103-atk-nano/board/Kconfig b/bsp/stm32/stm32f103-atk-nano/board/Kconfig
index 010389a3bb..0dfaab5960 100644
--- a/bsp/stm32/stm32f103-atk-nano/board/Kconfig
+++ b/bsp/stm32/stm32f103-atk-nano/board/Kconfig
@@ -178,11 +178,23 @@ menu "On-chip Peripheral Drivers"
         bool "Enable on-chip FLASH"
         default n 
 
-    config BSP_USING_ONCHIP_RTC
+    menuconfig BSP_USING_ONCHIP_RTC
         bool "Enable RTC"
         select RT_USING_RTC
         select RT_USING_LIBC
         default n
+        if BSP_USING_ONCHIP_RTC
+            choice
+                prompt "Select clock source"
+                default BSP_RTC_USING_LSE
+
+                config BSP_RTC_USING_LSE
+                    bool "RTC USING LSE"
+
+                config BSP_RTC_USING_LSI
+                    bool "RTC USING LSI"
+            endchoice
+        endif
 
     config BSP_USING_WDT
         bool "Enable Watchdog Timer"
diff --git a/bsp/stm32/stm32f103-atk-warshipv3/README.md b/bsp/stm32/stm32f103-atk-warshipv3/README.md
index 9eb3a0d011..5d2e0dce60 100644
--- a/bsp/stm32/stm32f103-atk-warshipv3/README.md
+++ b/bsp/stm32/stm32f103-atk-warshipv3/README.md
@@ -50,7 +50,7 @@ STM32F103战舰V3，资源丰富，接口多，功能强大，性价比高，资
 | SPI               |     支持     | SPI1/2                            	  |
 | I2C               |     支持     | 软件 I2C                              |
 | ADC               |     支持     |                                      |
-| RTC               |     支持     |                                      |
+| RTC               |     支持     | 支持外部晶振和内部低速时钟 |
 | PWM               |     支持     | TIM3 CH1  TIM3 CH2                   |
 | CAN               |     支持     |                                      |
 | IWG               |     支持     |                                      |
diff --git a/bsp/stm32/stm32f103-atk-warshipv3/board/Kconfig b/bsp/stm32/stm32f103-atk-warshipv3/board/Kconfig
index c5b7ccfd37..c23799f24f 100644
--- a/bsp/stm32/stm32f103-atk-warshipv3/board/Kconfig
+++ b/bsp/stm32/stm32f103-atk-warshipv3/board/Kconfig
@@ -178,11 +178,23 @@ menu "On-chip Peripheral Drivers"
         bool "Enable on-chip FLASH"
         default n 
 
-    config BSP_USING_ONCHIP_RTC
+    menuconfig BSP_USING_ONCHIP_RTC
         bool "Enable RTC"
         select RT_USING_RTC
         select RT_USING_LIBC
         default n
+        if BSP_USING_ONCHIP_RTC
+            choice
+                prompt "Select clock source"
+                default BSP_RTC_USING_LSE
+
+                config BSP_RTC_USING_LSE
+                    bool "RTC USING LSE"
+
+                config BSP_RTC_USING_LSI
+                    bool "RTC USING LSI"
+            endchoice
+        endif
 
     config BSP_USING_WDT
         bool "Enable Watchdog Timer"
diff --git a/bsp/stm32/stm32f103-fire-arbitrary/README.md b/bsp/stm32/stm32f103-fire-arbitrary/README.md
index e5f91b812f..85d1acc1e2 100644
--- a/bsp/stm32/stm32f103-fire-arbitrary/README.md
+++ b/bsp/stm32/stm32f103-fire-arbitrary/README.md
@@ -54,7 +54,7 @@
 | SPI          |     支持     | SPI1/2/3                              |
 | I2C          |     支持     | 软件 I2C                              |
 | ADC          |     支持     |                                      |
-| RTC          |     支持     |                                      |
+| RTC          |     支持     | 支持外部晶振和内部低速时钟 |
 | WDT          |     支持     |                                       |
 | FLASH | 支持 | 已适配 [FAL](https://github.com/RT-Thread-packages/fal) |
 | SDIO         |   暂不支持   | 即将支持                              |
diff --git a/bsp/stm32/stm32f103-fire-arbitrary/board/Kconfig b/bsp/stm32/stm32f103-fire-arbitrary/board/Kconfig
index 62f6ea86ce..db000c4808 100644
--- a/bsp/stm32/stm32f103-fire-arbitrary/board/Kconfig
+++ b/bsp/stm32/stm32f103-fire-arbitrary/board/Kconfig
@@ -250,11 +250,23 @@ menu "On-chip Peripheral Drivers"
                 default n
         endif
 
-    config BSP_USING_ONCHIP_RTC
+    menuconfig BSP_USING_ONCHIP_RTC
         bool "Enable RTC"
         select RT_USING_RTC
         select RT_USING_LIBC
         default n
+        if BSP_USING_ONCHIP_RTC
+            choice
+                prompt "Select clock source"
+                default BSP_RTC_USING_LSE
+
+                config BSP_RTC_USING_LSE
+                    bool "RTC USING LSE"
+
+                config BSP_RTC_USING_LSI
+                    bool "RTC USING LSI"
+            endchoice
+        endif
 
     config BSP_USING_WDT
         bool "Enable Watchdog Timer"
diff --git a/bsp/stm32/stm32f103-hw100k-ibox/README.md b/bsp/stm32/stm32f103-hw100k-ibox/README.md
index 0484e36107..dc7637caf6 100644
--- a/bsp/stm32/stm32f103-hw100k-ibox/README.md
+++ b/bsp/stm32/stm32f103-hw100k-ibox/README.md
@@ -48,7 +48,7 @@
 | UART              |     支持     | UART1                                 |
 | SPI               |   暂不支持   |                                       |
 | I2C               |     支持     | 软件 I2C (J14)                        |
-| RTC               |     支持     |                                       |
+| RTC               |     支持     | 支持外部晶振和内部低速时钟 |
 | ADC               |     支持     | ADC1_CHANEL_10, ADC1_CHANNEL_11       |
 | PWM               |   暂不支持   |                                       |
 | IWG               |    支持      | 命令：iwdg_sample wdt                 |
diff --git a/bsp/stm32/stm32f103-hw100k-ibox/board/Kconfig b/bsp/stm32/stm32f103-hw100k-ibox/board/Kconfig
index 4753a25654..875b025bb6 100644
--- a/bsp/stm32/stm32f103-hw100k-ibox/board/Kconfig
+++ b/bsp/stm32/stm32f103-hw100k-ibox/board/Kconfig
@@ -146,11 +146,25 @@ menu "On-chip Peripheral Drivers"
                 bool "Enable ADC1"
                 default n
         endif		
-    config BSP_USING_ONCHIP_RTC
+        
+    menuconfig BSP_USING_ONCHIP_RTC
         bool "Enable RTC"
         select RT_USING_RTC
         select RT_USING_LIBC
-        default n	
+        default n
+        if BSP_USING_ONCHIP_RTC
+            choice
+                prompt "Select clock source"
+                default BSP_RTC_USING_LSE
+
+                config BSP_RTC_USING_LSE
+                    bool "RTC USING LSE"
+
+                config BSP_RTC_USING_LSI
+                    bool "RTC USING LSI"
+            endchoice
+        endif
+
     config BSP_USING_WDT
         bool "Enable Watchdog Timer"
         select RT_USING_WDT
diff --git a/bsp/stm32/stm32f407-atk-explorer/README.md b/bsp/stm32/stm32f407-atk-explorer/README.md
index d7c3d20852..5e8432e01f 100644
--- a/bsp/stm32/stm32f407-atk-explorer/README.md
+++ b/bsp/stm32/stm32f407-atk-explorer/README.md
@@ -53,7 +53,7 @@
 | SPI          |     支持     |               SPI1/2/3                |
 | I2C          |     支持     |               软件 I2C                |
 | ADC          |     支持     |                                       |
-| RTC          |     支持     |                                       |
+| RTC          |     支持     | 支持外部晶振和内部低速时钟 |
 | WDT          |     支持     |                                       |
 | FLASH | 支持 | 已适配 [FAL](https://github.com/RT-Thread-packages/fal) |
 | PWM          |   支持   |                               |
diff --git a/bsp/stm32/stm32f407-atk-explorer/board/Kconfig b/bsp/stm32/stm32f407-atk-explorer/board/Kconfig
index 5da6237062..650ccf131f 100644
--- a/bsp/stm32/stm32f407-atk-explorer/board/Kconfig
+++ b/bsp/stm32/stm32f407-atk-explorer/board/Kconfig
@@ -193,11 +193,23 @@ menu "On-chip Peripheral Drivers"
                 default 25
         endif
 
-    config BSP_USING_ONCHIP_RTC
+    menuconfig BSP_USING_ONCHIP_RTC
         bool "Enable RTC"
         select RT_USING_RTC
         select RT_USING_LIBC
         default n
+        if BSP_USING_ONCHIP_RTC
+            choice
+                prompt "Select clock source"
+                default BSP_RTC_USING_LSE
+
+                config BSP_RTC_USING_LSE
+                    bool "RTC USING LSE"
+
+                config BSP_RTC_USING_LSI
+                    bool "RTC USING LSI"
+            endchoice
+        endif
 
     config BSP_USING_WDT
         bool "Enable Watchdog Timer"
diff --git a/bsp/stm32/stm32f429-armfly-v6/README.md b/bsp/stm32/stm32f429-armfly-v6/README.md
index 6c3fa945ca..3228861c51 100644
--- a/bsp/stm32/stm32f429-armfly-v6/README.md
+++ b/bsp/stm32/stm32f429-armfly-v6/README.md
@@ -54,7 +54,7 @@ armfly-v6 STM32F429 是安富莱推出的一款基于 ARM Cortex-M4 内核的开
 | SPI               |     支持     | SPI1/2/5                              |
 | I2C               |     支持     | 软件 I2C                              |
 | ADC               |     支持     |                                     |
-| RTC               |     支持     |                                      |
+| RTC               |     支持     | 支持外部晶振和内部低速时钟 |
 | WDT               |     支持     |                                       |
 | FLASH | 支持 | 已适配 [FAL](https://github.com/RT-Thread-packages/fal) |
 | SDIO              |   支持   |                               |
diff --git a/bsp/stm32/stm32f429-armfly-v6/board/Kconfig b/bsp/stm32/stm32f429-armfly-v6/board/Kconfig
index 4ecba0d5a3..af025cf400 100644
--- a/bsp/stm32/stm32f429-armfly-v6/board/Kconfig
+++ b/bsp/stm32/stm32f429-armfly-v6/board/Kconfig
@@ -182,11 +182,23 @@ menu "On-chip Peripheral Drivers"
                 default n
         endif
 
-    config BSP_USING_ONCHIP_RTC
+    menuconfig BSP_USING_ONCHIP_RTC
         bool "Enable RTC"
         select RT_USING_RTC
         select RT_USING_LIBC
         default n
+        if BSP_USING_ONCHIP_RTC
+            choice
+                prompt "Select clock source"
+                default BSP_RTC_USING_LSE
+
+                config BSP_RTC_USING_LSE
+                    bool "RTC USING LSE"
+
+                config BSP_RTC_USING_LSI
+                    bool "RTC USING LSI"
+            endchoice
+        endif
 
     config BSP_USING_WDT
         bool "Enable Watchdog Timer"
diff --git a/bsp/stm32/stm32f429-atk-apollo/README.md b/bsp/stm32/stm32f429-atk-apollo/README.md
index 318dd39144..3b0bfb376c 100644
--- a/bsp/stm32/stm32f429-atk-apollo/README.md
+++ b/bsp/stm32/stm32f429-atk-apollo/README.md
@@ -54,7 +54,7 @@
 | SPI               |     支持     | SPI1/2/5                              |
 | I2C               |     支持     | 软件 I2C                              |
 | ADC               |     支持     |                                     |
-| RTC               |     支持     |                                      |
+| RTC               |     支持     | 支持外部晶振和内部低速时钟 |
 | WDT               |     支持     |                                       |
 | FLASH | 支持 | 已适配 [FAL](https://github.com/RT-Thread-packages/fal) |
 | SDIO              |   支持   |                               |
diff --git a/bsp/stm32/stm32f429-atk-apollo/board/Kconfig b/bsp/stm32/stm32f429-atk-apollo/board/Kconfig
index e43d9db64f..c0d59a5512 100644
--- a/bsp/stm32/stm32f429-atk-apollo/board/Kconfig
+++ b/bsp/stm32/stm32f429-atk-apollo/board/Kconfig
@@ -219,11 +219,23 @@ menu "On-chip Peripheral Drivers"
                 default n
         endif
 
-    config BSP_USING_ONCHIP_RTC
+    menuconfig BSP_USING_ONCHIP_RTC
         bool "Enable RTC"
         select RT_USING_RTC
         select RT_USING_LIBC
         default n
+        if BSP_USING_ONCHIP_RTC
+            choice
+                prompt "Select clock source"
+                default BSP_RTC_USING_LSE
+
+                config BSP_RTC_USING_LSE
+                    bool "RTC USING LSE"
+
+                config BSP_RTC_USING_LSI
+                    bool "RTC USING LSI"
+            endchoice
+        endif
 
     config BSP_USING_WDT
         bool "Enable Watchdog Timer"
diff --git a/bsp/stm32/stm32f429-fire-challenger/README.md b/bsp/stm32/stm32f429-fire-challenger/README.md
index 9e7497d2fe..0c8d2c4044 100644
--- a/bsp/stm32/stm32f429-fire-challenger/README.md
+++ b/bsp/stm32/stm32f429-fire-challenger/README.md
@@ -55,7 +55,7 @@
 | SPI               |     支持     | SPI1/2/5                              |
 | I2C               |     支持     | 软件 I2C                              |
 | ADC               |     支持     |                                     |
-| RTC               |     支持     |                                      |
+| RTC               |     支持     | 支持外部晶振和内部低速时钟 |
 | WDT               |     支持     |                                       |
 | FLASH | 支持 | 已适配 [FAL](https://github.com/RT-Thread-packages/fal) |
 | SDIO              |   暂不支持   | 即将支持                              |
diff --git a/bsp/stm32/stm32f429-fire-challenger/board/Kconfig b/bsp/stm32/stm32f429-fire-challenger/board/Kconfig
index f0514211da..ea6183f4f2 100644
--- a/bsp/stm32/stm32f429-fire-challenger/board/Kconfig
+++ b/bsp/stm32/stm32f429-fire-challenger/board/Kconfig
@@ -204,11 +204,23 @@ menu "On-chip Peripheral Drivers"
                 default 23
         endif
 
-    config BSP_USING_ONCHIP_RTC
+    menuconfig BSP_USING_ONCHIP_RTC
         bool "Enable RTC"
         select RT_USING_RTC
         select RT_USING_LIBC
         default n
+        if BSP_USING_ONCHIP_RTC
+            choice
+                prompt "Select clock source"
+                default BSP_RTC_USING_LSE
+
+                config BSP_RTC_USING_LSE
+                    bool "RTC USING LSE"
+
+                config BSP_RTC_USING_LSI
+                    bool "RTC USING LSI"
+            endchoice
+        endif
 
     config BSP_USING_WDT
         bool "Enable Watchdog Timer"
diff --git a/bsp/stm32/stm32f746-st-disco/board/Kconfig b/bsp/stm32/stm32f746-st-disco/board/Kconfig
index 2f8bbead52..572cdfe02b 100644
--- a/bsp/stm32/stm32f746-st-disco/board/Kconfig
+++ b/bsp/stm32/stm32f746-st-disco/board/Kconfig
@@ -53,6 +53,7 @@ menu "On-chip Peripheral Drivers"
         bool "Enable GPIO"
         select RT_USING_PIN
         default y
+
     menuconfig BSP_USING_UART
         bool "Enable UART"
         default y
@@ -67,9 +68,11 @@ menu "On-chip Peripheral Drivers"
                 depends on BSP_USING_UART1 && RT_SERIAL_USING_DMA
                 default n
         endif
+
     config BSP_USING_ON_CHIP_FLASH
         bool "Enable on-chip FLASH"
         default n
+
     config BSP_USING_QSPI
         bool "Enable QSPI BUS"
         select RT_USING_QSPI
diff --git a/bsp/stm32/stm32f767-atk-apollo/README.md b/bsp/stm32/stm32f767-atk-apollo/README.md
index dc2080fc95..efec3e704b 100644
--- a/bsp/stm32/stm32f767-atk-apollo/README.md
+++ b/bsp/stm32/stm32f767-atk-apollo/README.md
@@ -55,7 +55,7 @@
 | SPI               |     支持     |                                       |
 | I2C               |     支持     | 软件 I2C                              |
 | ADC               |    支持     |                                     |
-| RTC               |     支持     |                                      |
+| RTC               |     支持     | 支持外部晶振和内部低速时钟 |
 | WDT               |     支持     |                                       |
 | PWM               |     支持     |                                       |
 | SDIO              |     支持     |                                       |
diff --git a/bsp/stm32/stm32f767-atk-apollo/board/Kconfig b/bsp/stm32/stm32f767-atk-apollo/board/Kconfig
index 676fb439da..04033b2424 100644
--- a/bsp/stm32/stm32f767-atk-apollo/board/Kconfig
+++ b/bsp/stm32/stm32f767-atk-apollo/board/Kconfig
@@ -216,11 +216,23 @@ menu "On-chip Peripheral Drivers"
                 default 117
         endif
 
-    config BSP_USING_ONCHIP_RTC
+    menuconfig BSP_USING_ONCHIP_RTC
         bool "Enable RTC"
         select RT_USING_RTC
         select RT_USING_LIBC
         default n
+        if BSP_USING_ONCHIP_RTC
+            choice
+                prompt "Select clock source"
+                default BSP_RTC_USING_LSE
+
+                config BSP_RTC_USING_LSE
+                    bool "RTC USING LSE"
+
+                config BSP_RTC_USING_LSI
+                    bool "RTC USING LSI"
+            endchoice
+        endif
 
     config BSP_USING_WDT
         bool "Enable Watchdog Timer"
diff --git a/bsp/stm32/stm32f767-fire-challenger/README.md b/bsp/stm32/stm32f767-fire-challenger/README.md
index b2779ad8e4..8d5dc360c9 100644
--- a/bsp/stm32/stm32f767-fire-challenger/README.md
+++ b/bsp/stm32/stm32f767-fire-challenger/README.md
@@ -56,7 +56,7 @@
 | SPI               |     支持     | SPI1/x/x                                                |
 | I2C               |     支持     | 软件 I2C                                                |
 | ADC               |     支持     |                                                         |
-| RTC               |     支持     |                                                         |
+| RTC               |     支持     | 支持外部晶振和内部低速时钟                              |
 | WDT               |     支持     |                                                         |
 | FLASH             |     支持     | 已适配 [FAL](https://github.com/RT-Thread-packages/fal) |
 | SDIO              |     支持     |                                                         |
diff --git a/bsp/stm32/stm32f767-fire-challenger/board/Kconfig b/bsp/stm32/stm32f767-fire-challenger/board/Kconfig
index 2e941dbb62..c3535dc5bc 100644
--- a/bsp/stm32/stm32f767-fire-challenger/board/Kconfig
+++ b/bsp/stm32/stm32f767-fire-challenger/board/Kconfig
@@ -188,11 +188,23 @@ menuconfig BSP_USING_SPI
                 default 23
         endif
 
-    config BSP_USING_ONCHIP_RTC
+    menuconfig BSP_USING_ONCHIP_RTC
         bool "Enable RTC"
         select RT_USING_RTC
         select RT_USING_LIBC
         default n
+        if BSP_USING_ONCHIP_RTC
+            choice
+                prompt "Select clock source"
+                default BSP_RTC_USING_LSE
+
+                config BSP_RTC_USING_LSE
+                    bool "RTC USING LSE"
+
+                config BSP_RTC_USING_LSI
+                    bool "RTC USING LSI"
+            endchoice
+        endif
 
     config BSP_USING_WDT
         bool "Enable Watchdog Timer"
diff --git a/bsp/stm32/stm32l432-st-nucleo/README.md b/bsp/stm32/stm32l432-st-nucleo/README.md
index 77a0093232..a19724f30c 100644
--- a/bsp/stm32/stm32l432-st-nucleo/README.md
+++ b/bsp/stm32/stm32l432-st-nucleo/README.md
@@ -43,7 +43,7 @@
 | UART              |     支持     | UART2                             |
 | SPI               |   暂不支持   | SPI1 即将支持                            |
 | I2C               |   暂不支持   | 软件 I2C 即将支持                      |
-| RTC               |   支持      |                                     |
+| RTC               |   支持      | 支持外部晶振和内部低速时钟 |
 | PWM               |   暂不支持   | 即将支持                              |
 | USB Device        |   暂不支持   | 即将支持                             |
 | IWG               |   支持      | 独立看门狗，未开启窗口模式              |
diff --git a/bsp/stm32/stm32l432-st-nucleo/board/Kconfig b/bsp/stm32/stm32l432-st-nucleo/board/Kconfig
index 47a2a2922b..e71484dcfa 100644
--- a/bsp/stm32/stm32l432-st-nucleo/board/Kconfig
+++ b/bsp/stm32/stm32l432-st-nucleo/board/Kconfig
@@ -39,11 +39,23 @@ menu "On-chip Peripheral Drivers"
         bool "Enable on-chip FLASH"
         default n
 
-    config BSP_USING_ONCHIP_RTC
+    menuconfig BSP_USING_ONCHIP_RTC
         bool "Enable RTC"
         select RT_USING_RTC
         select RT_USING_LIBC
         default n
+        if BSP_USING_ONCHIP_RTC
+            choice
+                prompt "Select clock source"
+                default BSP_RTC_USING_LSE
+
+                config BSP_RTC_USING_LSE
+                    bool "RTC USING LSE"
+
+                config BSP_RTC_USING_LSI
+                    bool "RTC USING LSI"
+            endchoice
+        endif
 
     config BSP_USING_WDT
         bool "Enable Watchdog Timer"
diff --git a/bsp/stm32/stm32l475-atk-pandora/README.md b/bsp/stm32/stm32l475-atk-pandora/README.md
index f21e891ed2..20d099a3f0 100644
--- a/bsp/stm32/stm32l475-atk-pandora/README.md
+++ b/bsp/stm32/stm32l475-atk-pandora/README.md
@@ -65,7 +65,7 @@
 | I2C               |     支持     |                                      |
 | TIM               |     支持     |                                      |
 | ADC               |     支持     |                                      |
-| RTC               |     支持     |                                      |
+| RTC               |     支持     | 支持外部晶振和内部低速时钟 |
 | WDT               |     支持     |                                      |
 | PWM               |     支持     |                                      |
 | USB Device        |   暂不支持   | 即将支持                              |
diff --git a/bsp/stm32/stm32l475-atk-pandora/board/Kconfig b/bsp/stm32/stm32l475-atk-pandora/board/Kconfig
index 28b7b0dde1..1e3e00f690 100644
--- a/bsp/stm32/stm32l475-atk-pandora/board/Kconfig
+++ b/bsp/stm32/stm32l475-atk-pandora/board/Kconfig
@@ -210,11 +210,23 @@ menu "On-chip Peripheral Drivers"
                 default n
         endif
 
-    config BSP_USING_ONCHIP_RTC
+    menuconfig BSP_USING_ONCHIP_RTC
         bool "Enable RTC"
         select RT_USING_RTC
         select RT_USING_LIBC
         default n
+        if BSP_USING_ONCHIP_RTC
+            choice
+                prompt "Select clock source"
+                default BSP_RTC_USING_LSE
+
+                config BSP_RTC_USING_LSE
+                    bool "RTC USING LSE"
+
+                config BSP_RTC_USING_LSI
+                    bool "RTC USING LSI"
+            endchoice
+        endif
 
     config BSP_USING_WDT
         bool "Enable Watchdog Timer"
diff --git a/bsp/stm32/stm32l476-st-nucleo/README.md b/bsp/stm32/stm32l476-st-nucleo/README.md
index a5443704a3..cd8ad13f9c 100644
--- a/bsp/stm32/stm32l476-st-nucleo/README.md
+++ b/bsp/stm32/stm32l476-st-nucleo/README.md
@@ -42,7 +42,7 @@
 | GPIO              |     支持     |          |
 | UART              |     支持     | UART2    |
 | IIC               |     支持     | 软件模拟 |
-| RTC               |     支持     | LSE 时钟源|
+| RTC               |     支持     | 支持外部晶振和内部低速时钟 |
 | **扩展模块**      | **支持情况** | **备注** |
 
 ## 使用说明
diff --git a/bsp/stm32/stm32l476-st-nucleo/board/Kconfig b/bsp/stm32/stm32l476-st-nucleo/board/Kconfig
index 3e5b0ed121..22ee3bb2a4 100644
--- a/bsp/stm32/stm32l476-st-nucleo/board/Kconfig
+++ b/bsp/stm32/stm32l476-st-nucleo/board/Kconfig
@@ -87,10 +87,23 @@ menu "On-chip Peripheral Drivers"
             endif
         endif
         
-    config BSP_USING_ONCHIP_RTC
+    menuconfig BSP_USING_ONCHIP_RTC
         bool "Enable RTC"
         select RT_USING_RTC
+        select RT_USING_LIBC
         default n
+        if BSP_USING_ONCHIP_RTC
+            choice
+                prompt "Select clock source"
+                default BSP_RTC_USING_LSE
+
+                config BSP_RTC_USING_LSE
+                    bool "RTC USING LSE"
+
+                config BSP_RTC_USING_LSI
+                    bool "RTC USING LSI"
+            endchoice
+        endif
         
 endmenu
 
diff --git a/bsp/stm32/stm32l496-ali-developer/README.md b/bsp/stm32/stm32l496-ali-developer/README.md
index ee3bc7479b..d4a5d3bccc 100644
--- a/bsp/stm32/stm32l496-ali-developer/README.md
+++ b/bsp/stm32/stm32l496-ali-developer/README.md
@@ -62,7 +62,7 @@ Developer Kit STM32L496 是阿里联合[诺行](http://www.notioni.com/)推出
 | I2C               |     支持     | 软件 I2C 2/3/4 |
 | TIM               |     支持     | TIM15/16/17 |
 | ADC               |     支持     | ADC1 |
-| RTC               |     支持     |                                      |
+| RTC               |     支持     | 支持外部晶振和内部低速时钟 |
 | WDT               |     支持     |                                      |
 | PWM               |     支持     | PWM3 |
 | USB Device        |   暂不支持   | 即将支持                              |
diff --git a/bsp/stm32/stm32l496-ali-developer/board/Kconfig b/bsp/stm32/stm32l496-ali-developer/board/Kconfig
index 7e565f4534..7b405f7a47 100644
--- a/bsp/stm32/stm32l496-ali-developer/board/Kconfig
+++ b/bsp/stm32/stm32l496-ali-developer/board/Kconfig
@@ -196,10 +196,23 @@ menu "On-chip Peripheral Drivers"
         default n
         select RT_USING_ADC
 
-    config BSP_USING_ONCHIP_RTC
+    menuconfig BSP_USING_ONCHIP_RTC
         bool "Enable RTC"
         select RT_USING_RTC
+        select RT_USING_LIBC
         default n
+        if BSP_USING_ONCHIP_RTC
+            choice
+                prompt "Select clock source"
+                default BSP_RTC_USING_LSE
+
+                config BSP_RTC_USING_LSE
+                    bool "RTC USING LSE"
+
+                config BSP_RTC_USING_LSI
+                    bool "RTC USING LSI"
+            endchoice
+        endif
 
     config BSP_USING_WDT
         bool "Enable Watchdog Timer"