Serial communication system and method of single chip microcomputer

Abstract

The invention provides a serial communication system and method of a single chip microcomputer. The serial communication system of the single chip microcomputer comprises: a first single chip microcomputer, a first signal sending port, a first signal receiving port, a first signal receiving module and a first signal sending module; and a second single chip microcomputer, a second signal sending port, a second signal receiving port, a second signal receiving module and a second signal sending module, wherein the first signal sending module is connected with the second signal receiving module via a signal line; the second signal sending module is connected with the first signal receiving module via a signal line; and the signal line is connected with a DC power supply with an output voltagebeing greater than +5.5V. According to the serial communication system of the single chip microcomputer provided by the invention, the DC power supply with the output voltage being greater than +5.5Vis connected to the signal line, thereby increasing the voltage and the current on the signal line, reducing the influence of the external interference to the information transmitted on the signal line, and improving the information transmission accuracy between the single chip microcomputers.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a single-chip serial communication system and a communication method. Background technique [0002] The existing single-chip microcomputer generally communicates through the built-in UART function module, SPI function module or I2C function module, or directly communicates serially through the I / O port of the single-chip microcomputer. Due to the high price of the microcontroller with built-in UART function module, SPI function module or I2C function module, in order to reduce the production cost, the method of direct serial communication of the I / O port of the microcontroller is generally used. However, the driving current of the I / O port is small, and the operating voltage of the single-chip microcomputer is small (generally 5V), which makes the signal transmitted by the direct serial communication of the I / O port of the single-chip microcomputer weak, and is easily s...

AI Technical Summary

Problems solved by technology

However, the driving current of the I / O port is small, and the operating voltage of the single-chip microcomputer is small (generally 5V), which makes the signal transmitted by the direct serial communication of the I / O port of the single-chip microcomputer weak and susceptible to external interference, especially when the transmitted signal When it is wound together with AC high voltage, it is easy to cause errors in signal transmission and cannot communicate normally

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