STC89c52 development board schematic, PCB diagram, containing the AD format schematic and PCB diagram, LED, dynamic 7 segment digital tube, buzzer, 4*4 matrix keyboard, RS232 serial port, PL2303usb serial port, suitable for learning microcontroller friends

51A.SchDoc
51A.PcbDoc
51A.pdf
51A.PRJPCB

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