单片机课后习题 - 图文(4)

MOV DPTR,#CONPORT MOVX @DPTR,A NOP

NOP

NOP NOP NOP

BEGIN:MOV R0，#00H LOOP:MOV B,#10 MOV A,R0 DIV AB

MOV DPTR,#TAB

MOVC A,@A+DPTR

XCH A,B

MOVC A,@A+DPTR MOV DPTR,#APORT

MOVX @DPTR,A MOV A,B

MOV DPTR,#BPORT MOVX @DPTR,A

INC R0

LCALL DELAY_1S CJNE R0，#100，LOOP LJMP BEGIN

DELAY_1S:MOV R7，#42H DL1: MOV R6，#0DAH DL0： MOV R5，#0CFH

DJNZ R5,$ DJNZ R6,DL0

DJNZ R7,DL1 RET

TAB:DB 0C0H,0F9H,0A4H,0B0H,99H,092H,082H,0F8H,080H,090H ;TAB是0-9对应的段码值表 END C51程序：

#include #include #include

#define APORT XBYTE[0XF8FF] #define BPORT XBYTE[0XF9FF] #define CONPORT XBYTE[0xFBFF]

unsingned char code seg[10]={0xC0,0xF9,0xA4, 0xB0,0x99,0x92,0x82,0xF8,0x80,0x90}; void delay_1s(); void main() {

unsinged char i; CONPORT=0x80; while(1) {

for(i=0;i<100;i++) {

APORT=seg[i/10]; BPORT=seg[i]； delay_1s(); } } }

void delay_1s() {

unsinged char a,b,c; for(c=142;c>0;c--)

} 11－8

for(b=168;b>0;b--)

for(a=250;a>0;a--);

如图11－46所示，在P1.0－P1.7引脚连接8个按键，分别定义为1号、2号….8

号，在P3口连接一个共阳极数码管，编写程序，使8个按键中任意一个按下时，数码管上显示对应的键序号。

图11－46 习题11－8题的电路

汇编语言程序：

ORG 0000H LJMP MAIN ORG 0100H

MAIN: MOV SP,#0AFH

MOV P1，#0FFH

NOP NOP NOP

LOOP:MOV A,P1

CJNE A,#0FFH,LOOP1 SJMP LOOP

LOOP1：LCALL DELAY_15ms

MOV A,P1

CJNE A,#0FFH,LOOP2 SJMP LOOP

LOOP2:

JNB ACC.0,KEY1 JNB ACC.1,KEY2 JNB ACC.2,KEY3

JNB ACC.3,KEY4 JNB ACC.4,KEY5

JNB ACC.5,KEY6 JNB ACC.6,KEY7 JNB ACC.7,KEY8 LJMP LOOP

KEY1: MOV P3,#0F9H

AJMP LOOP

KEY2: MOV P3,#0A4H

AJMP LOOP

KEY3: MOV P3,#0B0H

AJMP LOOP

KEY4: MOV P3,#99H

AJMP LOOP

KEY5: MOV P3,#92H

AJMP LOOP

KEY6: MOV P3,#82H

AJMP LOOP

KEY7: MOV P3,#0F8H

AJMP LOOP

KEY8: MOV P3,#80H

AJMP LOOP

DELAY_15ms:MOV R6,#177 DL0:

C51程序：

#include unsigned char temp,temp1; void delay_15ms(); void KEY1(); ……

void KEY8(); void main() { P1=0xFF; while(1) {

temp=P1; if(temp!=0xFF) {

delay_15ms(); temp=P1; if(temp!=0xFF) {

switch(temp) {

case 0xFE:KEY1();break; case 0xFD:KEY2();break;

MOV R5,#0 DJNZ R5,$ DJNZ R6,DL0 RET END