求：c51中用74HC138译码器控制数码管位选的从0到999的程序

Question

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Answer 1

#include<reg52.h>
#define uchar unsigned char
#define uint unsigned int
uchar a,bai,shi,ge;
uint temp;
uchar code table[]={
0x3f,0x06,0x5b,0x4f,
0x66,0x6d,0x7d,0x07,
0x7f,0x6f};
void init();
void display(uchar bai,uchar shi,uchar ge);
void delay(uchar z);
void main()
{
init();
while(1)
{
if(a==20)
{
a=0;
temp++;
if(temp==1000)
{
temp=0;
}
}
bai=temp/100;
shi=temp%100/10;
ge=temp%10;
display(bai,shi,ge);
}
}
void init()
{
TMOD=0x01;
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
EA=1;
ET0=1;
TR0=1;
}
void timer0() interrupt 1
{
TH0=(65535-50000)/256;
TL0=(65535-50000)%256;
a++;
}
void display(uchar bai,uchar shi,uchar ge)
{
P0=table[bai];
P2=5;
delay(1);

P0=table[shi];
P2=6;
delay(1);

P0=table[ge];
P2=7;
delay(1);
}
void delay(uchar z)
{
uchar i,j;
for(i=z;i>0;i--)
for(j=110;j>0;j--);
}