以下两个程序效果相同，一个使用汇编语言，一个使用C语言，从仿真效果看，c语言程序运行比较流畅。

两个外中断跑马灯汇编语言程序

ORG 0000H

LJMP MAIN

ORG 0003H

LJMP WZD0

ORG 0013H

LJMP WZD1

ORG 0040H

WZD0: MOV DPTR,#0220H

MOV R3,#42D

CB0:    CLR A

MOVC A,@A+DPTR

MOV P1,A

INC DPTR

LCALL DELAY2

DJNZ R3,CB0

RETI

WZD1: MOV DPTR,#0220H

MOV R3,#42D

CB1:  CLR A

MOVC A,@A+DPTR

MOV P2,A

INC DPTR

LCALL DELAY1

DJNZ R3,CB1

RETI

ORG 0150H

MAIN: MOV P1,#00H

MOV P2,#00H

SETB EA

SETB IT0

SETB EX0

CLR PX0

SETB IT1

SETB EX1

SETB PX1

ST:    MOV DPTR,#0270H

MOV R4,#17D

DD:   CLR A

MOVC A,@A+DPTR

MOV P0,A

INC DPTR

LCALL DELAY1

DJNZ R4,DD

SJMP ST

DELAY1: MOV R7,#00H

DD1: MOV R6,#00H

DD2: MOV R5,#01H

DJNZ R5,$

DJNZ R6,DD2

DJNZ R7,DD1

RET

DELAY2: MOV R7,#00H

DDD1: MOV R6,#00H

DJNZ R6,$

DJNZ R7,DDD1

RET

ORG 0220H

DB 0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80

DB 0x80,0x40,0x20,0x10,0x08,0x04,0x02,0x01

DB 0x18,0x24,0x42,0x81,0x00,0x81,0x42,0x24,0x18

DB 0x18,0x24,0x42,0x81,0x00,0x81,0x42,0x24,0x18

DB 0x18,0x00,0x3c,0x00,0x7e,0x00,0xff,0x00

ORG 0270H

DB  0xfe,0xfc,0xf8,0xe0,0xe0,0xc0,0x80,0x00

DB  0x01,0x03,0x07,0x0f,0x1f,0x3f,0x7f,0xff, 0x00

END

两个外中断跑马灯C语言程序

#include

int code yu[]={

0x00,0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80,

0x00,0x80,0x40,0x20,0x10,0x08,0x04,0x02,0x01,

0x00,0x18,0x24,0x42,0x81,0x00,0x81,0x42,0x24,0x18,

0x00,0x18,0x24,0x42,0x81,0x00,0x81,0x42,0x24,0x18,

0x00,0x18,0x00,0x3c,0x00,0x7e,0x00,0xff,0x00,0x00,

0x00     };

int code yu1[]={

0xfe,0xfc,0xf8,0xe0,0xe0,0xc0,0x80,0x00,

0x01,0x03,0x07,0x0f,0x1f,0x3f,0x7f,0xff,

0x00};

void delay(int ms)

{

while(ms--)

{

int i;

for(i=0;i<120;i++);

}

}

void ddd() interrupt 0

{

int k;

for(k=0;k<47;k++)

{

P2=yu[k];

delay(100);

}

}

void dd() interrupt 1

{

int k;

for(k=0;k<48;k++)

{

P1=yu[k];

delay(300);

}

P1=0x00;

}

void main()

{

int n;

IT0=0;

EX0=1;

PX0=1;

IT1=0;

EX1=1;

PX1=0;

EA=1;

P1=0x00;

P2=0x00;

while(1)

{

for(n=0;n<17;n++)

{

P0=yu1[n];

delay(100);

}

}