单片机汇编实验四：扫描键盘及LED显示实验.pdfVIP

单片机汇编实验四：扫描键盘及LED显

示实验

实验要求

利用P0口与行列式键盘接口，编写键盘扫描程序，

把按键输入的键码，显示在数码管上

//Thisisthefourthprogramofthehomework

//Thedate:2013/3/1

Theauthor：WQ

ORG0000H

SJMPMAIN

MAIN:

MOVDPTR,#TABLE

MOVR1,#00H

SETBP2.6

MOVP0,#00H

CLRP2.6

SETBP2.7

MOVP0,#0H;

CLRP2.7

SCAN:

//检测第一行

MOVP3,#0FEH;

MOVA,P3

ANLA,#0F0H

XHPD0:

CJNEA,#0F0H,OK0

CALLJIEDIAN

SJMPNO1

OK0:

CALLDELAY

MOVA,P3

ANLA,#0F0H

CJNEA,#0F0H,MM0

SJMPXHPD0

MM0:

CJNEA,#0E0H,MM1

MOVR1,#01H

CALLJIEDIAN

MM1:

CJNEA,#0D0H,MM2

MOVR1,#02H

CALLJIEDIAN

MM2:

CJNEA,#0B0H,MM3

MOVR1,#03H

CALLJIEDIAN

MM3:

CJNEA,#070H,XHPD0

MOVR1,#04H

CALLJIEDIAN

//检测第二行

NO1:

MOVP3,#0FDH;

MOVA,P3

ANLA,#0F0H

XHPD1:

CJNEA,#0F0H,OK1

CALLJIEDIAN

SJMPNO2

OK1:

CALLDELAY

MOVA,P3

ANLA,#0F0H

CJNEA,#0F0H,MM00

SJMPXHPD1

MM00:

CJNEA,#0E0H,MM10

MOVR1,#05H

CALLJIEDIAN

MM10:

CJNEA,#0D0H,MM20

MOVR1,#06H

CALLJIEDIAN

MM20:

CJNEA,#0B0H,MM30

MOVR1,#07H

CALLJIEDIAN

MM30:

CJNEA,#070H,XHPD1

MOVR1,#08H

CALLJIEDIAN

//检测第三行

NO2:

MOVP3,#0FBH;

MOVA,P3

ANLA,#0F0H

XHPD2:

CJNEA,#0F0H,OK2

CALLJIEDIAN

SJMPNO3

OK2:

CALLDELAY

MOVA,P3

ANLA,#0F0H

CJNEA,#0F0H,MM01

SJMPXHPD2

MM01:

CJNEA,#0E0H,MM11

MOVR1,#09H

CALLJIEDIAN

MM11:

CJNEA,#0D0H,MM21

MOVR1,#0AH

CALLJIEDIAN

MM21:

CJNEA,#0B0H,MM31

MOVR1,#0BH

CALLJIEDIAN

MM31:

CJNEA,#070H,XHPD2

MOVR1,#0CH

CALLJIEDIAN

//检测第四行

NO3:

MOVP3,#0F7H;

MOVA,P3

A