...99的计数器,采用按键计数,数码管显示,采用单片机内部的定时计数器完...答:include<reg51.h> define uchar unsigned char define uint unsigned int uchar DSY_CODE[]={0X3F,0X06,0X5B,0X4F,0X66,0X6D,0X7D,0X07,0X7F,0X6F};uchar count=0;void main(){ P0=0X00;P2=0X00;TMOD=0X06;//TMOD=0000 0110B,C/T=1,工作于计数方式 TH0=TL0=256-1;ET0=1; ...