c51单片机定时器30秒倒计时程序,一个按键控制开始,另一个按键控制暂停和...答:include<reg51.h>unsigned char code ledtab[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x40};//0-9unsigned char sec=30,scanled;unsigned char disdat[2];sbit keys=P1^0;sbit keyc=P1^1;sbit fmq=P3^0;void delay(unsigned int x){unsigned int i,j;for(i=...