STC89C51 single chip microcomputer has 40 pins, which are divided into four categories: power supply, clock, control and I / O pins. Its advantage is that it is easy to operate, and the original<br>There is no need to change the hardware, and it can be used directly<br>And low power consumption, low cost, strong anti-interference ability, can improve the product quality<br>Performance, which makes the operation and cost have great advantages.<br>The minimum system of single chip microcomputer is composed of power supply, crystal oscillator circuit and reset circuit<br>Circuit composition.<br>
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