51單片機驅動8個led燈使得其不斷的變換花樣閃爍達到廣告燈效果.
效果：使P1口作單一燈的變化：左移2次，右移2次，閃爍2次（延時0.2秒）
電路：單片機最小系統把八個led燈接在p1口即可.
下面是匯編語言程序：
ORG 0
START: MOV DPTR ,#TABLE
LOOP: CLR A
MOVC A,@A+DPTR
CJNE A,#01H,LOOP1
JMP START
LOOP1: MOV P1,A
MOV R3,#20
LCALL DELAY
INC DPTR
JMP LOOP
DELAY: MOV R4,#20
D1: MOV R5,#248
DJNZ R5,$
DJNZ R4,D1
DJNZ R3,DELAY
RET
TABLE: DB 0FEH,0FDH,0FBH,0F7H
DB 0EFH,0DFH,0BFH,07FH
DB 0FEH,0FDH,0FBH,0F7H
DB 0EFH,0DFH,0BFH,07FH
DB 07FH,0BFH,0DFH,0EFH
DB 0F7H,0FBH,0FDH,0FEH
DB 07FH,0BFH,0DFH,0EFH
DB 0F7H,0FBH,0FDH,0FEH
DB 00H,0FFH,00H,0FFH
DB 01H
END
下面是C語言程序：
#include<AT89X51.H>
unsigned char code table[ ]={
0xfe,0xfd,0xfb,0xf7,
0xef,0xdf,0xbf,0x7f,
0xfe,0xfd,0xfb,0xf7,
0xef,0xdf,0xbf,0x7f,
0x7f,0xbf,0xdf,0xef,
0xf7,0xfb,0xfd,0xfe,
0x7f,0xbf,0xdf,0xef,
0xf7,0xfb,0xfd,0xfe,
0x01};
unsigned char i;
void delay(void)
{unsigned char m,n,s;
for(m=20;m>0;m--)
for(n=20;n>0;n--)
for(s=248;s>0;s--);
}
void main(void)
{while(1)
{if(table[i]!=0x01)
{P1=table[i];
i++;
delay();
}
else
{i=0;
}
}
}