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
- uchar code SEG7[10]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};
- sbit D=P3^6;
- sbit V=P3^7;
- sbit P2_4=P2^4;
- uchar number1,number2;
- //===========
- void swap(uchar x,uchar y);
- //==========
- void delay(uint k)
- {
- uint i,j;
- for(i=0;i<k;i++){
- for(j=0;j<121;j++)
- {;}}
- }
- //===============
- void main(void)
- {
- uchar a=3,b=8;
- while(1)
- {
- if(!P2_4)
- { swap(a,b);
- D=1;P0=SEG7[number1];D=0;P0=0xff;V=1;P0=0xfd;V=0;delay(5);
- D=1;P0=SEG7[number2];D=0;P0=0xff;V=1;P0=0xfe;V=0;delay(5);}
- else
- {number1=a;number2=b;
- D=1;P0=SEG7[number1];D=0;P0=0xff;V=1;P0=0xfd;V=0;delay(5);
- D=1;P0=SEG7[number2];D=0;P0=0xff;V=1;P0=0xfe;V=0;delay(5);
-
- }
- }
- }
- //===========
- void swap(uchar x,uchar y)
- {
- number1=y;
- number2=x;
- }
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