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- #include<reg51.h>
- sbit P33=P3^3;
- void main()
- {
- IT1=1;
- EX1=1;
- EA=1;
- while(1);
- }
- void interrupt0() interrupt 2 using 2
- {
- static unsigned char Bit=0;
- Bit++;
- if(Bit>=4)Bit=0;
- switch(Bit)
- {
- case 0:P2=0x7f;break;
- case 1:P2=0xef;break;
- case 2:P2=0xdf;break;
- case 3:P2=0xbf;break;
- }
- }
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