8051 serial interface is a programmable full-duplex serial communication interface. It can be used as asynchronous communication (UART), serial transmission of information with external devices connected, or used through a standard full-duplex asynchronous communication protocol for the more than 8051 systems can also be synchronized using a TTL or CMOS shift register to expand the I/O port.

Packet : 53607935rs232.rar filelist
第七部分：串口通讯.pdf

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