The commonly used MCS51 and PIC series MCU are usually only one (or no) UART Asynchronous serial communication interface that requires multiple serial interfaces in an application system (for example, in a multi-machine communication system) In the case of a host that wants to communicate with both the machine and the terminal, the usual method is to extend An 8251 or 8250 universal synchronous/asynchronous receiver sending chip (USART) requires an additional order Tablet I/O resources. This paper introduces a method to achieve serial communication using single chip microcomputer In the minimum application system of single-chip microcomputer, the multi-machine communication with more than two serial interface devices is realized

89c51 IO口模拟串行口.pdf

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