The 51 microcontroller has a full-duplex serial communication port, so serial communication can be easily performed between the microcontroller and the computer. Certain conditions must be met when performing serial communication. For example, the serial port of the computer is RS232 level, while the serial port of the microcontroller is TTL level. There must be a level conversion circuit between the two. We use a dedicated chip MAX232 for conversion. Although several transistors can also be used for analog conversion, it is still simpler and more reliable to use a dedicated chip. We use a three-wire connection serial port, that is, only three of the wires are connected to the 9-pin serial port of the computer: GND on the 5th pin, RXD on the 2nd pin, and TXD on the 3rd pin. This is the simplest connection method, but it is enough for us. The circuit is shown in the figure below. The 10th pin of MAX232 is connected to the 11th pin of the microcontroller, the 9th pin is connected to the 10th pin of the microcontroller, and the 15th pin is connected to the 20th pin of the microcontroller. The hardware circuit of serial communication is shown in the figure below.
Keywords：C51
Reference address：Hardware circuit diagram of serial communication of C51 single chip microcomputer
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