#include <reg52.h>
#include <intrins.h>
#define uchar unsigned char
#define uint unsigned int
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,
0x76,0x79,0x38,0x3f,0};
uchar temp,t0,t1,bai,shi,ge,flag,flag1;
uint shu;
void init();
void display(uchar,uchar,uchar,uchar,uchar,uchar);
void delay(uint z)
{
uint t1,y;
for(t1=z;t1>0;t1--)
for(y=110;y>0;y--);
}
void main()
{
init();
while(1)
{
if(flag1!=1)
display(7,6,5,bai,shi,ge);
else
display(16,17,18,18,19,20);
}
}
void init()
{
shu=432;
temp=0xfe;
P1=temp;
TMOD=0x11;
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
TH1=(65536-50000)/256;
TL1=(65536-50000)%256;
EA=1;
ET0=1;
ET1=1;
TR0=1;
TR1=1;
}
void timer0() interrupt 1
{
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
t0++;
if(flag!=1)
{
if(t0==10)
{
t0=0;
temp=_crol_(temp,1);
P1=temp;
}
}
else
{
if(t0%4==0) //按照上面的temp=0xfe，P1也應(yīng)該是oxfe，但為什么調(diào)試的時候卻是oxff
P1=~P1;
if(t0==60)
{
TR0=0;
P1=0xff;
flag1=1;
}
}
}
void timer1() interrupt 3
{
TH1=(65536-50000)/256;
TL1=(65536-50000)%256;
t1++;
if(t1==2)
{
t1=0;
shu--;
bai=shu/100;
shi=shu%100/10;
ge=shu%10;
if(shu==398)
{
TR0=0;
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
TR0=1;
flag=1;
t0=0;
P1=0xff;
TR1=0;
}
}
}
void display(uchar aa,uchar bb,uchar cc,uchar ba,uchar sh,uchar g)
{
dula=1;
P0=table[aa];
dula=0;
P0=0xff;
wela=1;
P0=0xfe;
wela=0;
delay(1);
dula=1;
P0=table[bb];
dula=0;
P0=0xff;
wela=1;
P0=0xfd;
wela=0;
delay(1);
dula=1;
P0=table[cc];
dula=0;
P0=0xff;
wela=1;
P0=0xfb;
wela=0;
delay(1);
dula=1;
P0=table[ba];
dula=0;
P0=0xff;
wela=1;
P0=0xf7;
wela=0;
delay(1);
dula=1;
P0=table[sh];
dula=0;
P0=0xff;
wela=1;
P0=0xef;
wela=0;
delay(1);
dula=1;
P0=table[g];
dula=0;
P0=0xff;
wela=1;
P0=0xdf;
wela=0;
delay(1);
}
求解：if(t0%4==0) //按照上面的temp=0xfe，P1其中沒有變化，到這里也應(yīng)該是oxfe，但為什么調(diào)試的時候卻是oxff。還有疑問的是這個程序是不是
P1=~P1; 先取反閃爍一次 然后再運行到這里取反不亮 再運行到這里又閃爍一次 一直這樣下去之后滿足后面的if語句？
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