The use of single-chip AT89S51 P1.0 P1.3 with four light emitting diode L1 L4, used to indicate the current count data; using P1.4 P1.7 as the input end of the preset data K1 K4 switch, four toggle, two touch switch with P3.6/WR and P3.7/RD port, used to count and count down switch.

Reversible reversible 4 bit counter.docx

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