This project is based on STC89C52RC. Onboard power indicator light and P0^0 pin LED light, with reset circuit, clock circuit and P0 port exclusion, P0 analog push-pull can enhance driving capability. At the same time, TXD/RXD is also led out, which is suitable for using USB to TTL chip for program burning. This project leads out four groups of pins P0~3, and the pins in group P4 are rarely used and are not lead out.
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