There are flaws in the design: the CH340 power supply and the STC89C52 chip power supply are connected in parallel, and the switch will turn on or off the power supply of both at the same time, which will cause trouble when burning the program. According to the advice of the boss, when burning, first turn off the power and hold down the reset button, then turn on the power, wait for the computer to detect the CH340 chip, click burning, and then release the reset button.
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