单片机IO并行口直接驱动LED显示技术

6．汇编源程序

ORG 0

START: MOV R1,#00H

NEXT: MOV A,R1

MOV DPTR,#TABLE

MOVC A,@A+DPTR

MOV P0,A

LCALL DELAY

INC R1

CJNE R1,#10,NEXT

LJMP START

DELAY: MOV R5,#20

D2: MOV R6,#20

D1: MOV R7,#248

DJNZ R7,$

DJNZ R6,D1

DJNZ R5,D2

RET

TABLE: DB 3FH,06H,5BH,4FH,66H,6DH,7DH,07H,7FH,6FH

END

7． C语言源程序

#include AT89X51.H>

unsigned char code table[]={0x3f,0x06,0x5b,0x4f,0x66,

0x6d,0x7d,0x07,0x7f,0x6f};

unsigned char dispcount;

void delay02s(void)

{

unsigned char i,j,k;

for(i=20;i>0;i--)

for(j=20;j>0;j--)

for(k=248;k>0;k--);

}

void main(void)

{

while(1)

{

for(dispcount=0;dispcount10;dispcount++)

{

P0=table[dispcount];

delay02s();

}

}

}