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問一下下邊這個程序的mb是什么？99是怎么算出來的？謝謝
#include<reg51.h>
typedef unsigned char u8;
typedef unsigned int u16;
sbit LSA=P2^2;
sbit LSB=P2^3;
sbit LSC=P2^4;
u8 code smgduan[]={0x3f , 0x06 , 0x5b , 0x4f , 0x66 , 0x6d,0x7d , 0x07 ,
0x7f , 0x6f , 0x77 , 0x7c,0x39 , 0x5e , 0x79 , 0x71};
u16 i=1000;
u8 j=100,mb[2];
void Timer0Init()
{
TMOD|=0x01;
TH0=0XFC;
TL0=0X18;
TR0=1;
}
void delay(u16 i)
{
while(i--);
}
void digdisplay()
{
u8 i;
for(i=0;i<2;i++)
{
switch(i)
{
case 0:
LSA=0;LSB=0;LSC=0;break;
case 1:
LSA=1;LSB=0;LSC=0;break;
}
P0=smgduan[mb[1-i]];
delay(1);
P0=0x00;
}
}
void main()
{
Timer0Init();
while(1)
{
if(TF0==1)
{
TF0=0;
TH0=0XFC;
TL0=0X18;
i++;
}
if(i==1000)
{
i=0;
j--;
if(j==0)j=100;
}
mb[0]=j/10;
mb[1]=j%10;
digdisplay();
}
}
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