The definition is as follows: some MCU can download programs using serial ports, so the pin of the general burning program is the pin required by the serial port, such as TXD and R...
The definition is as follows: some MCU can download programs using serial ports, so the pin of the general burning program is the pin required by the serial port, such as TXD and RXD under 8051 programs, STM32 is PA9 and PA10 and so on
