Proteus-74HC595-SMG.zip，Proteus工程+KeilC51

#include <reg51.h> #include <intrins.h> sbit P0_0 = P0 ^ 0; sbit P0_1 = P0 ^ 1; sbit P0_2 = P0 ^ 2; sbit P3_7 = P3 ^ 7; // 数码管段码定义，共阴数码管 unsigned char code seg_code[] = { 0x3f, 0x06, 0x5b, 0x4f, 0x66, 0x6d, 0x7d, 0x07, 0x7f, 0x6f, // 0-9 }; // 延时函数 void delay(unsigned int time) { unsigned int i, j; for (i = 0; i < time; i++) for (j = 0; j < 1275; j++); } void delaynum(unsigned int time) { unsigned int i; for (i = 0; i < time; i++); } // 通过74HC595发送一个字节 void send_byte(unsigned char dat) { unsigned char i; P0_0 = 0; P0_1 = 0; P0_2 = 0; for (i = 0; i < 8; i++) { // P0_1 = 1; P0_1 = (dat & 0x80) >> 7; dat <<= 1; P0_0 = 1; _nop_(); _nop_(); P0_0 = 0; } P0_2 = 1; _nop_(); _nop_(); P0_2 = 0; } // 主函数 void main() { send_byte(seg_code[0]); delay(200); send_byte(seg_code[1]); delay(200); send_byte(seg_code[2]); delay(200); send_byte(seg_code[3]); delay(200); send_byte(seg_code[4]); delay(200); send_byte(seg_code[5]); delay(200); send_byte(seg_code[6]); delay(200); send_byte(seg_code[7]); delay(200); send_byte(seg_code[8]); delay(200); send_byte(seg_code[9]); delay(200); }