diff --git a/Examples/LL/USART/UART_RX_Interrupt/main.c b/Examples/LL/USART/UART_RX_Interrupt/main.c
new file mode 100644
index 0000000..23afd68
--- /dev/null
+++ b/Examples/LL/USART/UART_RX_Interrupt/main.c
@@ -0,0 +1,160 @@
+/***
+ * Demo: RX Interrupts
+ */
+#include "main.h"
+
+#define BUF_SIZE 128
+
+uint8_t pBuf[BUF_SIZE], ch;
+__IO uint8_t printFlag = 0, pos = 0;
+
+static void APP_SystemClockConfig(void);
+void APP_USART_Config(uint32_t baudRate);
+void APP_USART_IRQCallback(USART_TypeDef *USARTx);
+
+int main(void)
+{
+ APP_SystemClockConfig();
+ APP_USART_Config(115200);
+
+ printf("PY32F0 UART Interrupt RX Demo\r\nClock: %ld\r\n", SystemCoreClock);
+
+ while (1)
+ {
+ if (printFlag == 1)
+ {
+ LL_GPIO_TogglePin(GPIOB, LL_GPIO_PIN_5);
+ printf("%s\r\n", pBuf);
+ printFlag = 0;
+ pos = 0;
+ }
+ }
+}
+
+void USART2_IRQHandler(void)
+{
+ APP_USART_IRQCallback(USART2);
+}
+
+/**
+ * @brief USART2 GPIO & Interrupt Config
+ */
+void APP_USART_Config(uint32_t baudRate)
+{
+ LL_APB1_GRP1_EnableClock(LL_APB1_GRP1_PERIPH_USART2);
+
+ /* USART2 Init */
+ LL_USART_SetBaudRate(USART2, SystemCoreClock, LL_USART_OVERSAMPLING_16, baudRate);
+ LL_USART_SetDataWidth(USART2, LL_USART_DATAWIDTH_8B);
+ LL_USART_SetStopBitsLength(USART2, LL_USART_STOPBITS_1);
+ LL_USART_SetParity(USART2, LL_USART_PARITY_NONE);
+ LL_USART_SetHWFlowCtrl(USART2, LL_USART_HWCONTROL_NONE);
+ // Both direction
+ LL_USART_SetTransferDirection(USART2, LL_USART_DIRECTION_TX_RX);
+ LL_USART_Enable(USART2);
+ LL_USART_ClearFlag_TC(USART2);
+
+ LL_IOP_GRP1_EnableClock(LL_IOP_GRP1_PERIPH_GPIOA);
+ // PA2 ------> USART1_TX
+ LL_GPIO_SetPinMode(GPIOA, LL_GPIO_PIN_2, LL_GPIO_MODE_ALTERNATE);
+ LL_GPIO_SetPinSpeed(GPIOA, LL_GPIO_PIN_2, LL_GPIO_SPEED_FREQ_VERY_HIGH);
+ LL_GPIO_SetPinPull(GPIOA, LL_GPIO_PIN_2, LL_GPIO_PULL_UP);
+ LL_GPIO_SetAFPin_0_7(GPIOA, LL_GPIO_PIN_2, LL_GPIO_AF_4);
+ // PA3 ------> USART1_RX
+ LL_GPIO_SetPinMode(GPIOA, LL_GPIO_PIN_3, LL_GPIO_MODE_ALTERNATE);
+ LL_GPIO_SetPinSpeed(GPIOA, LL_GPIO_PIN_3, LL_GPIO_SPEED_FREQ_VERY_HIGH);
+ LL_GPIO_SetPinPull(GPIOA, LL_GPIO_PIN_3, LL_GPIO_PULL_UP);
+ LL_GPIO_SetAFPin_0_7(GPIOA, LL_GPIO_PIN_3, LL_GPIO_AF_4);
+
+ // Enable parity error interrupt
+ LL_USART_EnableIT_PE(USART2);
+ // Enable framing error, overrun error and noise error interrupt
+ LL_USART_EnableIT_ERROR(USART2);
+ // Enable RX not empty interrupt
+ LL_USART_EnableIT_RXNE(USART2);
+ // Interrupt priority
+ NVIC_SetPriority(USART2_IRQn, 1);
+ NVIC_EnableIRQ(USART2_IRQn);
+
+#if defined (__GNUC__) && !defined (__clang__)
+ // To avoid io buffer
+ setvbuf(stdout, NULL, _IONBF, 0);
+ setvbuf(stdin, NULL, _IONBF, 0);
+#endif
+}
+
+void APP_USART_IRQCallback(USART_TypeDef *USARTx)
+{
+ // Parity Error
+ if (LL_USART_IsActiveFlag_PE(USARTx))
+ {
+ LL_USART_ClearFlag_PE(USARTx);
+ }
+ // Framing Error
+ if (LL_USART_IsActiveFlag_FE(USARTx))
+ {
+ LL_USART_ClearFlag_FE(USARTx);
+ }
+ // OverRun Error
+ if (LL_USART_IsActiveFlag_ORE(USARTx))
+ {
+ LL_USART_ClearFlag_ORE(USARTx);
+ }
+ // Noise error
+ if (LL_USART_IsActiveFlag_NE(USARTx))
+ {
+ LL_USART_ClearFlag_NE(USARTx);
+ }
+ // RX Not Empty, RX Not Empty Interrupt is enabled
+ if (LL_USART_IsActiveFlag_RXNE(USARTx) && LL_USART_IsEnabledIT_RXNE(USARTx))
+ {
+ // Read one byte
+ ch = LL_USART_ReceiveData8(USARTx);
+
+ if (ch == '\r' || ch == '\n')
+ {
+ // Set print flag when meet \r or \n, ignore empty string
+ if (pos > 0)
+ {
+ pBuf[pos++] = '\0';
+ printFlag = 1;
+ }
+ }
+ else
+ {
+ // Append new char
+ pBuf[pos++] = ch;
+ if (pos == BUF_SIZE)
+ {
+ pos = 0;
+ }
+ }
+ // Read USART_DR will clear RXNE flag, so LL_USART_ClearFlag_RXNE() is not necessary
+ }
+}
+
+static void APP_SystemClockConfig(void)
+{
+ LL_RCC_HSI_Enable();
+ while(LL_RCC_HSI_IsReady() != 1);
+
+ LL_RCC_SetAHBPrescaler(LL_RCC_SYSCLK_DIV_1);
+ LL_RCC_SetSysClkSource(LL_RCC_SYS_CLKSOURCE_HSISYS);
+ while(LL_RCC_GetSysClkSource() != LL_RCC_SYS_CLKSOURCE_STATUS_HSISYS);
+
+ LL_RCC_SetAPB1Prescaler(LL_RCC_APB1_DIV_1);
+ LL_Init1msTick(8000000);
+ LL_SetSystemCoreClock(8000000);
+}
+
+void APP_ErrorHandler(void)
+{
+ while (1);
+}
+
+#ifdef USE_FULL_ASSERT
+void assert_failed(uint8_t *file, uint32_t line)
+{
+ while (1);
+}
+#endif /* USE_FULL_ASSERT */
diff --git a/Examples/LL/USART/UART_RX_Interrupt/main.h b/Examples/LL/USART/UART_RX_Interrupt/main.h
new file mode 100644
index 0000000..f7e9d04
--- /dev/null
+++ b/Examples/LL/USART/UART_RX_Interrupt/main.h
@@ -0,0 +1,57 @@
+/**
+ ******************************************************************************
+ * @file main.h
+ * @author MCU Application Team
+ * @brief Header for main.c file.
+ * This file contains the common defines of the application.
+ ******************************************************************************
+ * @attention
+ *
+ * © Copyright (c) Puya Semiconductor Co.
+ * All rights reserved.
+ *
+ * © Copyright (c) 2016 STMicroelectronics.
+ * All rights reserved.
+ *
+ * This software component is licensed by ST under BSD 3-Clause license,
+ * the "License"; You may not use this file except in compliance with the
+ * License. You may obtain a copy of the License at:
+ * opensource.org/licenses/BSD-3-Clause
+ *
+ ******************************************************************************
+ */
+
+/* Define to prevent recursive inclusion -------------------------------------*/
+#ifndef __MAIN_H
+#define __MAIN_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Includes ------------------------------------------------------------------*/
+#include
+#include "py32f0xx_ll_rcc.h"
+#include "py32f0xx_ll_bus.h"
+#include "py32f0xx_ll_system.h"
+#include "py32f0xx_ll_exti.h"
+#include "py32f0xx_ll_cortex.h"
+#include "py32f0xx_ll_utils.h"
+#include "py32f0xx_ll_pwr.h"
+#include "py32f0xx_ll_dma.h"
+#include "py32f0xx_ll_gpio.h"
+#include "py32f0xx_ll_usart.h"
+
+/* Private includes ----------------------------------------------------------*/
+/* Private defines -----------------------------------------------------------*/
+/* Exported variables prototypes ---------------------------------------------*/
+/* Exported functions prototypes ---------------------------------------------*/
+void APP_ErrorHandler(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __MAIN_H */
+
+/************************ (C) COPYRIGHT Puya *****END OF FILE******************/
diff --git a/Examples/LL/USART/UART_RX_Interrupt/py32f0xx_it.c b/Examples/LL/USART/UART_RX_Interrupt/py32f0xx_it.c
new file mode 100644
index 0000000..2d2f6e3
--- /dev/null
+++ b/Examples/LL/USART/UART_RX_Interrupt/py32f0xx_it.c
@@ -0,0 +1,84 @@
+/**
+ ******************************************************************************
+ * @file py32f0xx_it.c
+ * @author MCU Application Team
+ * @brief Interrupt Service Routines.
+ ******************************************************************************
+ * @attention
+ *
+ * © Copyright (c) Puya Semiconductor Co.
+ * All rights reserved.
+ *
+ * © Copyright (c) 2016 STMicroelectronics.
+ * All rights reserved.
+ *
+ * This software component is licensed by ST under BSD 3-Clause license,
+ * the "License"; You may not use this file except in compliance with the
+ * License. You may obtain a copy of the License at:
+ * opensource.org/licenses/BSD-3-Clause
+ *
+ ******************************************************************************
+ */
+
+/* Includes ------------------------------------------------------------------*/
+#include "main.h"
+#include "py32f0xx_it.h"
+
+/* Private includes ----------------------------------------------------------*/
+/* Private typedef -----------------------------------------------------------*/
+/* Private define ------------------------------------------------------------*/
+/* Private macro -------------------------------------------------------------*/
+/* Private variables ---------------------------------------------------------*/
+/* Private function prototypes -----------------------------------------------*/
+/* Private user code ---------------------------------------------------------*/
+/* External variables --------------------------------------------------------*/
+
+/******************************************************************************/
+/* Cortex-M0+ Processor Interruption and Exception Handlers */
+/******************************************************************************/
+/**
+ * @brief This function handles Non maskable interrupt.
+ */
+void NMI_Handler(void)
+{
+}
+
+/**
+ * @brief This function handles Hard fault interrupt.
+ */
+void HardFault_Handler(void)
+{
+ while (1)
+ {
+ }
+}
+
+/**
+ * @brief This function handles System service call via SWI instruction.
+ */
+void SVC_Handler(void)
+{
+}
+
+/**
+ * @brief This function handles Pendable request for system service.
+ */
+void PendSV_Handler(void)
+{
+}
+
+/**
+ * @brief This function handles System tick timer.
+ */
+void SysTick_Handler(void)
+{
+}
+
+/******************************************************************************/
+/* PY32F0xx Peripheral Interrupt Handlers */
+/* Add here the Interrupt Handlers for the used peripherals. */
+/* For the available peripheral interrupt handler names, */
+/* please refer to the startup file. */
+/******************************************************************************/
+
+/************************ (C) COPYRIGHT Puya *****END OF FILE******************/
diff --git a/Examples/LL/USART/UART_RX_Interrupt/py32f0xx_it.h b/Examples/LL/USART/UART_RX_Interrupt/py32f0xx_it.h
new file mode 100644
index 0000000..633fddb
--- /dev/null
+++ b/Examples/LL/USART/UART_RX_Interrupt/py32f0xx_it.h
@@ -0,0 +1,49 @@
+/**
+ ******************************************************************************
+ * @file py32f0xx_it.h
+ * @author MCU Application Team
+ * @brief This file contains the headers of the interrupt handlers.
+ ******************************************************************************
+ * @attention
+ *
+ * © Copyright (c) Puya Semiconductor Co.
+ * All rights reserved.
+ *
+ * © Copyright (c) 2016 STMicroelectronics.
+ * All rights reserved.
+ *
+ * This software component is licensed by ST under BSD 3-Clause license,
+ * the "License"; You may not use this file except in compliance with the
+ * License. You may obtain a copy of the License at:
+ * opensource.org/licenses/BSD-3-Clause
+ *
+ ******************************************************************************
+ */
+
+
+/* Define to prevent recursive inclusion -------------------------------------*/
+#ifndef __PY32F0XX_IT_H
+#define __PY32F0XX_IT_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Private includes ----------------------------------------------------------*/
+/* Exported types ------------------------------------------------------------*/
+/* Exported constants --------------------------------------------------------*/
+/* Exported macro ------------------------------------------------------------*/
+/* Exported functions prototypes ---------------------------------------------*/
+void NMI_Handler(void);
+void HardFault_Handler(void);
+void SVC_Handler(void);
+void PendSV_Handler(void);
+void SysTick_Handler(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __PY32F0XX_IT_H */
+
+/************************ (C) COPYRIGHT Puya *****END OF FILE******************/