編程怎麼接入數顯

A. 單片機控制74LS164控制數碼管顯示怎麼編程(匯編語言)

74LS164是串入並出轉換晶元，可以藉助串口來實現，也可以用普通IO口模擬實現。舉例如下：

#include<reg51.h>

#define uchar unsigned char

uchar table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f};

sbit keyup=P3^6;

sbit keydn=P3^7;

void delay()

{

int i=1000;

while(i--);

}

main()

{

uchar i;

i=0;

SCON=0x00;

TI=1;

while(1)

{

SBUF=table[i];

while(TI==0);

TI=0;

delay();

if(keyup==0)

{

i++;

while(keyup==0);

}

if(keydn==0)

{

if(i>0)i--;

while(keydn==0);

}

i%=10;

}

}

B. 51單片機中，如何編程使其按下第一個開關數顯顯示0（或1）...按下第8個開關數顯顯示7（或8）...

程序如下:

ORG0000H

;-----------------------------------------

START:

MOVA,P1;讀入8個按鍵.

MOVB,A

CPLA

JZSTART

MOVR6,#8

CALLDL_R6_MS;延時消抖.

MOVA,P1;讀入8個按鍵.

CJNEA,B,START

;-----------------------------------------

WAIT_KEY:

MOVA,P1;讀入8個按鍵.

CPLA

JNZWAIT_KEY;等待按鍵釋放.

;-----------------------------------------

MOVR2,#0;按鍵號碼.

JNBB.0,_0

JNBB.1,_1

JNBB.2,_2

JNBB.3,_3

JNBB.4,_4

JNBB.5,_5

JNBB.6,_6

;-----------------------------------------

INCR2

_6:INCR2

_5:INCR2

_4:INCR2

_3:INCR2

_2:INCR2

_1:INCR2

_0:

;-----------------------------------------

MOVA,R2

MOVDPTR,#DUAN

MOVCA,@A+DPTR;

CPLA

MOVP0,A

SJMPSTART

;----------------------------------------------

DUAN:

DB0C0H,0F9H,0A4H,0B0H,99H,92H,82H,0F8H,80H,90H

;0123456789

;----------------------------------------------

DELAY1MS:;延時:999T=1ms

MOVR7,#241

DJNZR7,$

DJNZR7,$

RET

;----------------------------------------------

DL_R6_MS:;延時:R6*1ms

ACALLDELAY1MS

DJNZR6,$-2

RET