To create a manual counter using AT89S51 microcontroller, in AT89S51 MCU P3.7 pin as a touch switch, manual counting button, P2.0 using microcontroller P2.7 with a common cathode digital tube, as a number of 00 - 99 count display, microcontroller P0.0 P0.7 received a total of Yin digital tube, as the 00 - 99 count ten digit display

00-99 counter.docx

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