是用51hei单片机开发板 电路图详见:http://www.51hei.com/f/51hei-5.pdf 的数码管部分, 用2个74hc573 锁存,p0口作为数据口 ,p3.6和p3.7分别是段和位的锁存端口.P2口上面是按键
- #include<reg52.h>
- #define uchar unsigned char
- #define uint unsigned int
- 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 a,b;
- uchar *p;
- p=&b;
- a=0x7f;
- *p=0x7f;
- while(1)
- {
- D=1;P0=b;D=0;P0=0xff;V=1;P0=0xf7;V=0;delay(5);
- D=1;P0=a;D=0;P0=0xff;V=1;P0=0xfe;V=0;delay(5);
- }
- }
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