原创 走马灯程序

C51源程序：

#include<reg51.h><?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />

void delay(void)

{

  unsigned int i;

  for(i=0;i<50000;i++);

  return;

  }

int main(void)

{

  unsigned char led,led1,led2;

  unsigned char i;

  do

  {

   led=0x<?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" />7f;

   for(i=1;i<=8;i++)

       {

         led1=led>>i;

         led2=led<<(8-i);

         P0=led1|led2;

         delay();

       }

  }

  while(1);

}

汇编源代码：

ORG 0000H

      AJMP START

      ORG 30H

START:MOV A,#7FH

      MOV R0,#8

LOOP: RR A

      MOV P0,A

      ACALL DELAY

      DJNZ R0,LOOP

      AJMP START

DELAY:MOV R7,#20

DEL1: MOV R6,#100

DEL2: MOV R5,#248

      DJNZ R5,$

      DJNZ R6,DEL2

      DJNZ R7,DEL1

      RET

      END