单片机汇编语言，用的芯片是c51，编程实现9-0的倒计时，插线最好也说一下

Question

如题所述

Answer 1

#include<reg51.h>
#define uchar unsigned char
uchar tab[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x00}; //0到9
uchar cnt=0,dat=9;
void t0isr() interrupt 1
{
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
cnt++;
if(cnt>=20)
{
cnt=0;
dat--;
P1=tab[dat];
if(dat==0)dat=9;
}
}
main()
{
TMOD=0x01;
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
TR0=1;
ET0=1;
EA=1;
P1=tab[dat];
while(1);
}本回答被网友采纳