Key recognition schematic based on C51 single chip microcomputer

Single chip microcomputer STM32L151CCU6
1206RGB (single)
Mobile phone crystal 3.2*2.5mm 3225 26M (26.000MHZ)
0201 package SLP0603 ESD electrostatic diode 5V one-way ESD
Probe domestic double-head probe 038-BB-5.7L The shape of the two ends of the needle is outside the pointed needle

Each time the switch SP1 is pressed, the count value is incremented by one, and its binary count value is displayed by P1.0 to P1.3 of the P1 port of the AT89S51 microcontroller.

(1. Connect the P3.7/RD port in the "Microcontroller System" area to the SP1 port in the "Stand-alone Keyboard" area;

(2. Connect the P1.0 - P1.4 port in the "Microcontroller System" area to the "L1 - L8" port in the "Eight LED Indicator Module" area with an 8-pin cable; Requirement, P1.0 Connection 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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