Each time you press the switch SP1, the count is incremented by P1.0 AT89S51 microcontroller port P1 to P 1.3 shows its binary count value.
(1 of the "SCM system" area of P3.7 / RD port is connected to the "stand-alone keyboard" area of SP1 port;
(2 of the "SCM system" area of P1.0 - P1.4 port with 8-core cable connected to the "Eight LEDs indicate module" area - the "L1 L8" port; requirements, P1.0 connection to L1, P1.1 connected to L2, P1.2 connected to L3, P1.3 connected to L4.
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