- #include<reg52.h>
- typedef unsigned char U8_BYTE;
- typedef unsigned int U16_WORD;
- void delay(U16_WORD k);
- //=================
- void main(void)
- {
- U8_BYTE val;
- while(1)
- {
- val=0x55;
- P1=val;
- delay(500);
- val=0xaa;
- P1=val;
- delay(500);
- }
- }
- //===============
- void delay(U16_WORD k)
- {
- U16_WORD i,j;
- for(i=0;i<k;i++){
- for(j=0;j<121;j++)
- {;}}
- }
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