题目具体要求:web
数码管能够显示任意一个两位数。svg
仿真实验电路图:
实验代码:spa
#include <at89x51.h> unsigned char duanma[]={0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F,0x77,0x7C,0x39,0x5E,0x79,0x71}; unsigned int shuzi; sbit yi=P1^1; sbit er=P1^0; void delay(); void main() { shuzi=79; while(1) { P2=0x00;//很重要,不然数码管极可能没法正常显示 yi=0; er=1; P2=duanma[shuzi%10]; delay(); yi=1; er=0; P2=duanma[shuzi/10]; delay(); } } void delay() { unsigned int i,j; for(i=0;i<100;i++); for(j=0;j<10;j++); }