Schematic diagram of timer design based on C51 single chip microcomputer

Single chip microcomputer STM32L151CCU6

1206RGB (single)

0201 package SLP0603 ESD electrostatic diode 5V one-way ESD

Mobile phone crystal 3.2*2.5mm 3225 26M (26.000MHZ) 7.5PF 10PPM 20PPM 30PPM

Probe domestic double-head probe 038-BB-5.7L The shape of the two ends of the needle is outside the pointed needle

As shown in the figure below, the P0 and P2 ports of the AT89S51 MCU are connected with two common digital P0 ports to drive the display of the tenth time of the second time, while the P2 port drive displays the ones of the second time.

1. Connect the P0.0/AD0 - P0.7/AD7 ports in the "Microcontroller System" area to any of the a - h ports in the "Quad Static Digital Display Module" area with an 8-pin cable; P0.0/A D0 corresponds to a, P0.1/AD1 corresponds to b, ..., and P0.7/AD7 corresponds to h.

2. Connect the P2.0/A8 - P2.7/A15 port in the "Microcontroller System" area to the 8-a static digital display module area on any of the a - h ports; P2.0/A8 corresponds to a, P2.1/A9 corresponds to b, ..., and P2.7/A15 corresponds to h.