The following content is selected from Guo Tianxiang's books:
Serial communication mode:
The necessary process of serial communication: when sending, parallel data must be converted into serial data and sent to the line; when receiving, the serial signal must be converted back into parallel data so that it can be processed by computers and other devices.
There are two types of serial communication: asynchronous serial communication and synchronous serial communication.
Asynchronous serial communication mode:
Synchronous serial communication:
TTL and RST232 level conversion:
The relationship between baud rate and timer initial value:
It must be very high.
Serial port structure description:
Programming and implementation of method 1:
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