Hardware circuit C51 microcontroller serial communication

51 microcontroller has a full-duplex serial communication port, so you can easily serial communication between the microcontroller and the computer. When the serial communicati
Hardware circuit C51 microcontroller serial communication - schematic

on to meet certain conditions, such as PCs serial port is RS232 level, while the microcontroller is TTL level serial port, there must be a level conversion circuit between the two, we were using a dedicated chip MAX232 conversion, although you can also simulate the conversion with a few transistors, but still with a special chip easier and more reliable. We use a three-wire serial connection, which means that the computer and the 9-pin serial connector which is only three lines: 5 feet GND, RXD 2 feet, 3 feet of TXD. This is the easiest connection method, but enough for us to use the circuit as shown below, 11-pin connector MAX232 pin 10 and the microcontroller, 9 feet and the microcontroller 10-pin connector, and the first 15 feet MCU 20-pin connector. Serial communication hardware circuit as shown below.

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