上下數66-99

#include <at89x52.h>
char seg_7_table[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};
char scan_line[]={0xfe,0xfd};
char bcd[]={6,6};
char bdata flag;
sbit up_flag=flag^0;
sbit down_flag=flag^1;
sbit sw1=P3^0;
int count=66;
int time=20,j;
void delay_1ms(int k)
{
int i,j;
for(i=0;i<k;i++)
for(j=0;j<114;j++)
       ;
}
void main()
{
IE=0x8A;
TMOD=0x10;
TH0=(8192-5000)/32;
TL0=(8192-5000)%32;
TH1=(65536-50000)/256;
TL1=(65536-50000)%256;
TR0=1;
TR1=1;
up_flag=1;
down_flag=0;
while(1)
{
if(sw1==0)
{
up_flag=~up_flag;down_flag=~down_flag;
delay_1ms(20);
while(sw1!=1);
delay_1ms(20);
}
}
}
void T0_int(void) interrupt 1
{
TH0=(8192-5000)/32;
TL0=(8192-5000)%32;
P1=seg_7_table[bcd[j]];
P2=scan_line[j];
j++;
if(j==2)
{
j=0;
}
}
void T1_int(void) interrupt 3
{
TH1=(65536-50000)/256;
TL1=(65536-50000)%256;
  time--;
if(time==0)
{
time=20;
if(up_flag==1)
{
  count++;
  if(count>99)
  {
  count=66;
  }
  bcd[0]=count%10;
  bcd[1]=count /10;
  }
else if(down_flag==1)
{
count--;
  if(count<66)
  {
  count=99;
  }
  bcd[0]=count%10;
  bcd[1]=count /10;
}
   }
}