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目的实现按秒计数并达到一定值归零isis仿真由于无法上传视频没办法看数字变化，截两张图作对比，大家可以看运行时间和显示时间作比较（会有一点误差，因为初值计算需要时间）c代码#include<reg52.h>code unsigned char SEG[]={0XC0,0XF9,0XA4,0XB0,0X99,0X92,0X82,0XF8,0X80,0X90};char i,cp;/*中断服务函数*/ void ti(void) interrupt 1{ /*设初值*/

目的实现：按键数码管数字加减，运用外部中断函数，消除按键抖动isis仿真c代码#include<reg52.h>code unsigned char SEG[]={0XC0,0XF9,0XA4,0XB0,0X99,0X92,0X82,0XF8,0X80,0X90};char i=97,j,key1_s,key2_s; sbit key1=P1^2;sbit key2=P3^2;/*延时函数*/void delay(unsigned int x){ while(x-