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你要求的功能，我做到了。
#include <reg51.h>
#define GPIO_DIG P0//數(shù)碼管
sbit LSA=P2^2;//138譯碼器
sbit LSB=P2^3;
sbit LSC=P2^4;
unsigned char code DIG_CODE[16]={0x3f,0x06,
0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,
0x7c,0x39,0x5e,0x79,0x71};//標(biāo)準(zhǔn)十六進(jìn)制碼(段碼)
unsigned char DisplayData[3];
unsigned int SS=999,TT=0,i=0;
bit A=0;
void DigDisplay()
{
unsigned char i,j;
for(i=0;i<3;i++)
{
switch(i)
{
case(0):
LSA=0;LSB=0;LSC=0; break;
case(1):
LSA=1;LSB=0;LSC=0; break;
case(2):
LSA=0;LSB=1;LSC=0; break;
}
GPIO_DIG=DisplayData[i];//發(fā)送段碼
j=10;
while(j--);
GPIO_DIG=0x00;
}
}
void TimerConfiguration()
{
TMOD = 0x01;
TH0 = 0x3c;
TL0 = 0xB0;
PT0=1;
EA = 1;
ET0 = 1;
TR0=1;
}
void IntConfiguration()
{
IT1=1;
EX1=1;
EA=1;
}
void Delay10ms(unsigned int c)
{
unsigned char a,b;
for(c;c>0;c--)
for(b=38;b>0;b--)
for(a=130;a>0;a--);
}
void XS(void)
{
DisplayData[2]=DIG_CODE[SS/100];
DisplayData[1]=DIG_CODE[(SS%100)/10];
DisplayData[0]=DIG_CODE[(SS%10)/1];
}
void main ()
{
TimerConfiguration();
IntConfiguration();
while(1)
{
XS();
DigDisplay();
}
}
void Timer0() interrupt 1
{
TH0 = 0x3c;
TL0 = 0xb0;
TT++;
if (TT>=20)
{
TT=0;
if (A==0)
{
SS--;
if (SS>999)
{
SS=999;
}
}
else
{
SS++;
if (SS>999)
{
SS=0;
}
}
}
TF0=0;
}
void Int1(void) interrupt 2//K4
{
Delay10ms(5);
A=~A;
if (A==0)
{
SS=999;
}
else
{
SS=0;
}
Delay10ms(10);
IE1=0;
}
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