As shown in the figure, switch SP1 is connected to the P3.7/RD pin. Four light-emitting diodes are connected to the P1 port of the AT89S51 microcontroller. When the power is on, the light-emitting diode L1 connected to the P1.0 pin flashes. Every time the switch SP1 is pressed, the light-emitting diode L2 connected to the P1.1 pin flashes. When the switch SP1 is pressed again, the light-emitting diode L3 connected to the P1.2 pin flashes. When the switch SP1 is pressed again, the light-emitting diode L4 connected to the P1.3 pin flashes. When the switch SP1 is pressed again, it is the turn of L1 to flash, and so on.
(1. Connect the P3.7/RD port in the "MCU System" area to the SP1 port in the "Standalone Keyboard" area;
(2. Connect the P1.0 - P1.4 ports in the "MCU System" area to the "L1 - L8" ports in the "Eight-way LED Indicator Module" area with an 8-core cable; requirements: P1.0 is connected to L1, P1.1 is connected to L2, P1.2 is connected to L3, and P1.3 is connected to L4.
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