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#include<reg52.h>
#define uint unsigned int
#define uchar unsigned char
uchar temp,aa,bai,shi,ge;
sbit dula=P2^6;
sbit wela=P2^7;
uchar code table[]={
0x3f,0x06,0x5b,0x4f,
0x66,0x6d,0x7d,0x07,
0x7f,0x6f,0x77,0x7c,
0x39,0x5e,0x79,0x71};
void display(uchar bai,uchar shi,uchar ge);
void delay(uint z);
void init();
void main()
{
init();//3õê¼»ˉ×ó3ìDò
while(1)
{
if(aa==20)
{
aa=0;
temp++;
if(temp==100)
{
temp=0;
}
bai=temp/100;
shi=temp%100/10;
ge=temp%10;
}
display(bai,shi,ge);
}
}
void delay(uint z)
{
uint x,y;
for(x=z;x>0;x--)
for(y=110;y>0;y--);
}
void display(uchar bai,uchar shi,uchar ge)
{
dula=1;
P0=table[bai];
dula=0;
P0=0xff;
wela=1;
P0=0xfe;
wela=0;
delay(1); //display程序中為什么這里不需要P0置位？
dula=1;
P0=table[shi];
dula=0;
P0=0xff;
wela=1;
P0=0xfd;
wela=0;
delay(1);
dula=1;
P0=table[ge];
dula=0;
P0=0xff;
wela=1;
P0=0xfb;
wela=0;
delay(1);
}
void init() //沒太看懂這個函數(shù)除了申明中斷開關的開斷，具體有什么含義
{
wela=0;
dula=0;
temp=0;
TMOD=0x01;
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
EA=1;
ET0=1;
TR0=1;
}
void timer0() interrupt 1 //關于中斷的函數(shù)，在main函數(shù)中具體在哪里發(fā)生中斷？
{
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
aa++; //aa從0開始自增，為什么可以增加的20？
}
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