AT89S51 MCU with P0.0/AD0-P0.7/AD7 port access digital tube side of the a-h, 8-bit digital control of the S1-S8 through the 74LS138 decoder to control the Y0-Y7 each gating bit digital tube end election. AT89S51 MCU P1.0-P1.2 control 74LS138 of A, B, C terminal. In the 8-bit digital tube display from right to left circle, " 12345678." Able to smooth Curtain to see results.

AT89S51.doc

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