共陰極數碼管，開發板一上電，所有數碼管都顯示8.
代碼如下
#include<reg52.h>
#define uint unsigned int
#define uchar unsigned char
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 num)
{
dula=1;
P0=table[num];
dula=0;
}
void main()
{
TMOD=0X20;
TH1=0XFD;
TL1=0XFD;
TR1=1;
REN=1;
SM0=0;
SM1=1;
EA=1;
ES=1;
dula=0;
wela=0;
while(1);
}
void ser() interrupt 4
{
uchar a;
RI=0;
a=SBUF;
display(a);
wela=1;
P0=0XC0;
wela=0;
}
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