单片机实验题目及答案

1234，要求用按键修改数码管上的值一个按键作位选键、一个作加1键。

0000，要求实现电子钟功能，只显示分秒，按键用来校正电子钟的时间，一个按键作位选键、一个作加1键。

3、 如下图所示，数码管初始显示12345678，要求用按键修改数码管上的值一个按键作位

选键、一个作加1键。

4、 如下图所示，甲乙两单片机，在甲单片机上有两按键，在乙单片机上有4只数码管，初始显示1234，要求用甲单片机的按键修改乙单片机上数码管的值一个按键作位选键、一个作加1键。

信号发生器，产生频率为1K的信号，用单片机测出此信号源的频率，并将频率值用16进制的方式显示在4位数码管上。

信号，此信号频率为1K，用单片机测出此信号源的每个周期中高电平的持续时间（测脉宽），并将测脉宽值用16进制的方式显示在4位数码管上。

一、

数码管+按键

disbuf0 equ 30h disbuf1 equ 31h disbuf2 equ 32h disbuf3 equ 33h ORG 0000h ajmp main main: mov sp, #70h mov disbuf0, #4 mov disbuf1, #3 mov disbuf2, #2 mov disbuf3, #1 mov r4, #0 mov r5, #0 loop: call display call key ajmp loop

display: mov p2, #-1 mov a, #disbuf0 add a, r5 mov r0, a mov a, @r0

mov dptr, #disptab movc a, @a+dptr mov p0, a

mov dptr, #weitab mov a, r5 movc a, @a+dptr mov p2, a inc r5 cjne r5, #4, dispok mov r5, #0 dispok: ret disptab: DB 3FH, 06H, 5BH, 4FH, 66H, 6DH, 7DH, 07H, 7FH, 6FH

weitab: DB 0F7H,0FBH,0FDH,0FEH

二、

电子钟

key: jnb p3.0, key_sel jnb p3.1, key_inc ajmp keyok key_sel: inc r4 cjne r4, #4, sel_up mov r4, #0 sel_up: jnb p3.0, $ ajmp keyok key_inc: mov a, #disbuf0 add a, r4 mov r0, a inc @r0 cjne @r0, #10, inc_up mov @r0, #0 inc_up: jnb p3.1, $ ajmp keyok keyok: ret end

buf0 EQU 30H buf1 EQU 31H buf2 EQU 32H buf3 EQU 33H count_S EQU 40H count_M EQU 41H ORG 0000H Ajmp Main ORG 001BH

Ajmp inter_T1 Main:

CALL init_T1

数码管个数

送地址中的值计数

;R5 ;R0,R1 ;R2

MOV R5, #0 MOV buf0, #0 MOV buf1, #0 MOV buf2, #0 MOV buf3, #0 Loop: CALL Display AJMP Loop init_T1: MOV A, TMOD ANL A, #0FH ORL A, #10H MOV TMOD, A

;高四位清零，低四位保留

MOV TH1, #HIGH(-10000) MOV TL1, #LOW(-10000) SETB ET1 SETB EA SETB TR1 RET inter_T1: PUSH ACC PUSH PSW INC R2 CJNE R2, #100, Wait_S MOV R2, #0

INC count_S MOV A, count_S

CJNE A, #60, dealnum MOV count_S, #0

INC count_M MOV A, count_M CJNE A, #60, dealnum MOV count_M, #0

dealnum: CALL HextoBCD Wait_s:

MOV TL1, #LOW(-10000) POP PSW POP ACC RETI

HextoBCD: MOV A, count_M MOV B, #10 DIV AB MOV buf3, A MOV buf2, B MOV A, count_S MOV B, #10 DIV AB MOV buf1, A MOV buf0, B RET

Display:

MOV P2,#-1 MOV A, #buf0 ADD A, R5 MOV R0, A MOV A, @R0 MOV DPTR, #DispTab MOVC A, @A+DPTR MOV P0, A MOV DPTR, #WeiTab MOV A, R5 MOVC A, @A+DPTR MOV P2, A INC R5 CJNE R5, #4, Dispok MOV R5, #0 Dispok: RET DispTab: DB 3FH, 06H, 5BH, 4FH, 66H, 6DH DB 7DH, 07H, 7FH, 6FH, 76H WeiTab: DB 0F7H,0FBH,0FDH,0FEH

END

八位数码管+573

disbuf0 equ 30h

disbuf1 equ 31h

disbuf2 equ 32h

disbuf3 equ 33h

disbuf4 equ 34h

disbuf5 equ 35h

disbuf6 equ 36h

disbuf7 equ 37h

ORG 0000H

ajmp main

main: mov sp,#70h

mov disbuf0,#8

mov disbuf1,#7

mov disbuf2,#6

mov disbuf3,#5

mov disbuf4,#4

mov disbuf5,#3

mov disbuf6,#2

mov disbuf7,#1

mov r5,#0

mov r4,#0

loop: call disp

call key

ajmp loop

disp: mov a,#disbuf0

add a,r5

mov r0,a

mov a,@r0

mov p0,#-1

setb p3.0

clr p3.0

mov dptr,#distab

movc a,@a+dptr ;call delay

三、

mov p0,a

setb p2.0

clr p2.0

mov dptr,#weitab

mov a,r5

movc a,@a+dptr

mov p0,a

setb p3.0

clr p3.0

inc r5

cjne r5,#8,disok

mov r5,#0

disok: ret

key: jnb p3.6,key_sel

jnb p3.7,key_inc

ret

key_sel: inc r4

cjne r4,#8,key_up

mov r4,#0

key_up: jnb p3.6,$

ret

key_inc: mov a,#disbuf0

add a,r4

mov r0,a

mov a,@r0

inc a

cjne a,#10,up

mov a,#0

up: jnb p3.7,$

mov @r0,a

ret

;delay: mov r7,#0fh ;l1: mov r6,#0fh ; djnz r6,$ ; djnz r7,l1 ; ret

四、

distab: weitab: end db 3fh,06h,5bh,4fh,66h,6dh,7dh,07h,7fh,6fh db 07fh,0bfh,0dfh,0efh,0f7h,0fbh,0fdh,0feh 串行通信- 按键 ORG 0000H ajmp main main: mov sp, #70 call init_es loop: call key ajmp loop key: jnb P1.6, key_sel jnb p1.7, key_inc ajmp keyok key_sel: jnb p1.6, $ mov a, #01h mov sbuf ,a jnb ti, $ clr ti ajmp keyok key_inc: jnb p1.7, $ mov a, #02h mov sbuf, a jnb ti, $ clr ti keyok:ret init_es: mov a, tmod anl a, #0fh orl a, #20h mov tmod,a mov scon, #50h mov th1, #(-11059200/(384*9600)) setb es

串行通信-接收

setb ea setb tr1 ret end disbuf0 equ 30h disbuf1 equ 31h disbuf2 equ 32h disbuf3 equ 33h org 0000h ajmp main org 0023h ajmp inter_es main: mov sp, #70h mov r4, #0 mov r5, #0 mov disbuf0, #1 mov disbuf1, #2 mov disbuf2, #3 mov disbuf3, #4 call init_es loop: call display ajmp loop init_es: mov a, tmod anl a, #0fh orl a, #20h mov tmod, a mov scon, #50h mov th1, #(-11059200/(384*9600)) setb es setb ea setb tr1 ret inter_es: push acc push psw clr ri

cjne a, #01h, next_inc inc r4 cjne r4, #4, interok mov r4, #0 ajmp interok next_inc: cjne a, #02h, interok mov a, #disbuf0 add a, r4 mov r0, a inc @r0 cjne @r0, #10, interok mov @r0, #0 interok: pop psw pop acc reti display: mov a, #disbuf0 add a, r5 mov r0, a mov a, @r0 mov p2, #-1 mov dptr, #disptab movc a, @a+dptr mov p0, a mov dptr, #weitab mov a, r5 movc a, @a+dptr mov p2, a inc r5 cjne r5, #4, dispok mov r5, #0 dispok: ret disptab: db 3fh, 06h, 5bh, 4fh, 66h, 6dh, 7dh, 07h, 7fh, 6fh weitab: db 0f7h, 0fbh, 0fdh, 0feh end

五、

测频率 disbuf0 equ 30h disbuf1 equ 31h disbuf2 equ 32h disbuf3 equ 33h org 0000h ajmp main org 001bh ajmp inter_t1 main: mov sp, #70h call init_t1 loop: call display ajmp loop init_t1: mov tmod, #15h mov th0, #0 mov tl0, #0 mov th1, #high(-10000) mov tl1, #low(-10000) setb et1 setb ea setb tr1 setb tr0 ret inter_t1: push acc push psw inc r2 mov th1, #high(-10000) mov tl1, #low(-10000) cjne r2, #100, ok mov r2, #0 clr tr0 clr tr1 call hextobcd mov th0, #0 mov tl0, #0 setb tr1 setb tr0

49H, 51H, 79H, 71H

ok: pop psw pop acc reti hextobcd: mov a, th0 mov b, #16 div ab mov disbuf3, a mov disbuf2, b mov a, tl0 mov b, #16 div ab mov disbuf1, a mov disbuf0, b ret display: mov p2, #-1 mov a, #disbuf0 add a, r5 mov r0, a mov a, @r0 mov dptr, #disptab movc a, @a+dptr mov p0, a mov dptr, #weitab mov a, r5 movc a, @a+dptr mov p2, a inc r5 cjne r5, #4, dispok mov r5, #0 dispok: ret disptab: DB 3fh,06h, 5bh,4fh, 66h, 6dh, 7dh, 07h, 7fh, 6fh, 77h,7CH, weitab: DB 0F7H,0FBH,0FDH,0FEH End

六、

测脉宽 disbuf0 equ 30h disbuf1 equ 31h disbuf2 equ 32h disbuf3 equ 33h org 0000h ajmp main main: mov sp, #70 call init_t1 loop: call pulse call display ajmp loop init_t1: mov a, tmod anl a, #0fh orl a, #90h mov tmod, a ret pulse: mov th1, #0 mov tl1, #0 jb p3.3, $ jnb p3.3, $ setb tr1 jb p3.3, $ clr tr1 call hextobcd hextobcd: mov a, th1 mov b, #16 div ab mov disbuf3, a mov disbuf2, b mov a, tl1 mov b, #16 div ab mov disbuf1, a mov disbuf0, b ret display:

mov p2, #-1 mov a, #disbuf0 add a, r5 mov r0, a mov a, @r0 mov dptr, #disptab movc a, @a+dptr mov p0, a

79H, 71H

mov dptr, #weitab mov a, r5 movc a, @a+dptr mov p2, a inc r5 cjne r5, #4, dispok mov r5, #0 dispok: ret disptab: DB 3FH, 06H, 5BH, 4FH, 66H, 6DH DB 7DH, 07H, 7FH, 6FH, 77H, 7CH, 49H, 5EH, WeiTab: DB 0F7H,0FBH,0FDH,0FEH END