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                                样例使用说明
                             Sample Description
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功能描述：
此样例演示RTC的秒中断和闹钟中断功能。每次秒中断，在中断函数中会打印字符“RTC_IT_SEC”
并输出实时时间。

Function descriptions:
This sample demonstrates the RTC's second interrupt and alarm interrupt 
functionality. Each time the second interrupt occurs, the interrupt function 
prints the string "RTC_IT_SEC" and outputs the current RTC count time.
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测试环境：
测试用板：PY32MD420_STK
MDK版本： 5.28
IAR版本： 9.20
GCC 版本：GNU Arm Embedded Toolchain 10.3-2021.10

Test environment:
Test board: PY32MD420_STK
MDK Version: 5.28
IAR Version: 9.20
GCC Version: GNU Arm Embedded Toolchain 10.3-2021.10
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使用步骤：
1. 编译并下载程序到MCU。
2. 在PC端打开串口调试助手，并正确连接到通讯COM口。
3. 按下STK板的复位按键。串口调试助手将每秒钟接收到字符串"RTC_IT_SEC"和当前RTC计数时间。

Example execution steps:
1. Compile and download the program to the MCU.
2. Open a serial terminal on the PC and correctly connect to the corresponding 
   COM port.
3. Press the reset button on the STK board. The serial terminal will receive 
   the string "RTC_IT_SEC" and the current RTC count time every second.
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注意事项：
打印字符需要通过串口调试助手在上位机上显示。
使用USB转TTL模块将PC与STK板连接起来。STK板与USB转TTL模块的连线方式如下：
@PrintfConfigStart
   STK板        USB转TTL模块
   PA2(TX) --> RX
   PA3(RX) --> TX
   GND      --> GND
UART配置为波特率115200，数据位8，停止位1，校验位None
@PrintfConfigEnd

Notes:
The printed characters need to be displayed on the PC through a serial terminal.
Connect the PC and the STK board using a USB to TTL module. The wiring 
   between the STK board and the USB to TTL module is as follows:
@PrintfConfigStart
   STK board      USB to TTL module
   PA2(TX)  -->   RX
   PA3(RX)  -->   TX
   GND      -->   GND
UART is configured as BaudRate 115200, data bit 8, stop bit 1, and parity None.
@PrintfConfigEnd
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