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不知道是從左邊、還是從右邊，自己移一下
#include <reg51.h>
sbit wei1 = P2^0;
sbit wei2 = P2^1;
sbit wei3 = P2^2;
sbit wei4 = P2^3;
sbit led = P1^0;
unsigned char segdat[16]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,};
unsigned int cnt=0,kevval;
void delay(unsigned int x);
void display_seg4(unsigned int dat,unsigned char tim);
void INIT_int0(void);
unsigned int js=0;
unsigned char flag=0;
void main(void){
INIT_int0();
while(1){
if(flag==1){
js++;
if(js>=1000){
js=0;
}
}
if(flag==0){
js=0;
}
display_seg4(js,2);
}
}
void zduan(void) interrupt 0{
flag++;
if(flag==3){
flag=0;
}
}
void delay(unsigned int x){
unsigned int i,j;
for(i=0;i<x;i++){
for(j=0;j<100;j++){
;
}
}
}
void INIT_int0(void){
IT0=1;
IE0=0;
EX0=1;
EA=1;
}
void display_seg4(unsigned int dat,unsigned char tim){
unsigned char tmp;
tmp=dat/1000%10;
P1=segdat[tmp];
wei1=1;
delay(20);P1=0xff;wei1=0;
tmp=dat/100%10;
P1=segdat[tmp];
wei2=1;
delay(20); P1=0xff;wei2=0;
tmp=dat/10%10;
P1=segdat[tmp] & 0x7f; //////////////////////////////這個 & 0x7f 加上去就是顯示小數(shù)點(diǎn)
wei3=1;
delay(20); P1=0xff;wei3=0;
tmp=dat%10;
P1=segdat[tmp];
wei4=1;
delay(20); P1=0xff;wei4=0;
}
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