是用51hei單片機開發板 電路圖詳見：http://m.zg4o1577.cn/f/51hei-5.pdf 的數碼管部分， 用2個74hc573 鎖存，p0口作為數據口 ，p3.6和p3.7分別是段和位的鎖存端口.
- #include<reg52.h>
- #define uchar unsigned char
- #define uint unsigned int
- #define S(a,b) (a-b)*3
- uchar code SEG7[10]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};
- sbit D=P3^6;
- sbit V=P3^7;
- //========================
- void delay(uint k)
- {
- uint i,j;
- for(i=0;i<k;i++){
- for(j=0;j<121;j++)
- {;}}
- }
- //==================
- void main(void)
- {
- uchar out;
- out=S(100,50);
- while(1)
- {
- D=1;
- P0=SEG7[out/100];
- D=0;
- P0=0xff;
- V=1;
- P0=0xfe;
- V=0;
- delay(1);
- D=1;
- P0=SEG7[(out%100)/10];
- D=0;
- P0=0xff;
- V=1;
- P0=0xfd;
- V=0;
- delay(1);
- D=1;
- P0=SEG7[out%10];
- D=0;
- P0=0xff;
- V=1;
- P0=0xfb;
- V=0;
- delay(1);
- }
- }
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