怎么用AT89S51单片机汇编语言制作一个十进制加法计算器？

2025-03-11 07:32:02

推荐回答（1个）

回答（1）：

KEYVAL EQU 30H

KEYTM EQU 31H

KEYSCAN EQU 32H

DAT EQU 33H

SCANLED EQU 37H

S_DAT EQU 38H

D_DAT EQU 39H

R_DATL EQU 3AH

R_DATH EQU 3BH

CALFLAG EQU 3CH

FLAG BIT 00H

ORG 0000H

LJMP MAIN

ORG 000BH

LJMP T0ISR

ORG 0030H

MAIN:

MOV SP,#5FH

MOV TMOD,#01H

MOV TH0,#0D8H

MOV TL0,#0F0H

MOV KEYVAL,#0

MOV P2,#00H

MOV SCANLED,#0

MOV 33H,#0H

MOV 34H,#0H

MOV 35H,#0H

MOV 36H,#0H

MOV S_DAT,#0

MOV D_DAT,#0

CLR FLAG

SETB EA

SETB ET0

SETB TR0

LOOP:

LCALL KEYSEL

MOV A,KEYVAL

CJNE A,#0FFH,LOOP1

SJMP LOOP

LOOP1:

CJNE A,#11,LOOP2 ;“=”

MOV A,33H

MOV B,#10

MUL AB

ADD A,34H

MOV D_DAT,A

LCALL DEALDAT

LCALL HB2

MOV A,R5

ANL A,#0FH

MOV 34H,A

MOV A,R5

SWAP A

ANL A,#0FH

MOV 33H,A

MOV A,R4

ANL A,#0FH

MOV 36H,A

MOV A,R4

SWAP A

ANL A,#0FH

MOV 35H,A

SJMP LOOP

LOOP2:

CJNE A,#15,LOOP3 ;“+”

LCALL GETDAT

SJMP LOOP

LOOP3:

CJNE A,#14,LOOP4 ;“-”

MOV CALFLAG,#1

LCALL GETDAT

SJMP LOOP

LOOP4:

CJNE A,#13,LOOP5 ;“*”

MOV CALFLAG,#2

LCALL GETDAT

SJMP LOOP

LOOP5:

CJNE A,#12,LOOP6 ;"/"

MOV CALFLAG,#3

LCALL GETDAT

SJMP LOOP

LOOP6:

CJNE A,#10,LOOP7 ;数字键

LOOP7:

JC LOOP8

LJMP LOOP

LOOP8:

MOV 33H,34H

MOV 34H,KEYVAL

LJMP LOOP

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

HB2:

MOV R6,R_DATH

MOV R7,R_DATL

CLR A ;BCD码初始化

MOV R3,A

MOV R4,A

MOV R5,A

MOV R2,#10H ;转换双字节十六进制整数

HB3:

MOV A,R7 ;从高端移出待转换数的一位到 CY 中

RLC A

MOV R7,A

MOV A,R6

RLC A

MOV R6,A

MOV A,R5 ;BCD码带进位自身相加，相当于乘2

ADDC A,R5

DA A ;十进制调整

MOV R5,A

MOV A,R4

ADDC A,R4

DA A

MOV R4,A

MOV A,R3

ADDC A,R3

MOV R3,A ;双字节十六进制数的万位数不超过6，不用调整

DJNZ R2,HB3 ;处理完16bit

RET

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

GETDAT:

MOV A,33H

MOV B,#10

MUL AB

ADD A,34H

MOV S_DAT,A

MOV 33H,#0

MOV 34H,#0

MOV 35H,#0

MOV 36H,#0

RET

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

DEALDAT:

MOV A,CALFLAG

JNZ DEAL01

DEAL00: ;+

MOV A,S_DAT

ADD A,D_DAT

MOV R_DATL,A

CLR A

ADDC A,#0

MOV R_DATH,A

RET

DEAL01: ;=

DEC A

JNZ DEAL02

CLR C

MOV A,S_DAT

SUBB A,D_DAT

MOV R_DATL,A

SUBB A,#0

MOV R_DATH,A

RET

DEAL02: ;*

DEC A

JNZ DEAL03

MOV A,S_DAT

MOV B,D_DAT

MUL AB

MOV R_DATL,A

MOV R_DATH,B

RET

DEAL03: ;/

MOV A,S_DAT

MOV B,D_DAT

DIV AB

MOV R_DATL,A

MOV R_DATH,#0

RET

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

KEYSEL:

MOV KEYVAL,#0

MOV KEYSCAN,#0EFH

LCALL GETKEY

MOV A,KEYTM

JZ KEYS1

MOV KEYVAL,A

SJMP KEYRTN

KEYS1:

MOV KEYSCAN,#0DFH

LCALL GETKEY

MOV A,KEYTM

JZ KEYS2

CLR C

ADD A,#4

MOV KEYVAL,A

SJMP KEYRTN

KEYS2:

MOV KEYSCAN,#0BFH

LCALL GETKEY

MOV A,KEYTM

JZ KEYS3

CLR C

ADD A,#8

MOV KEYVAL,A

SJMP KEYRTN

KEYS3:

MOV KEYSCAN,#7FH

LCALL GETKEY

MOV A,KEYTM

JZ KEYRTN

CLR C

ADD A,#12

MOV KEYVAL,A

KEYRTN:

LCALL CHGKEY

RET

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

GETKEY:

MOV KEYTM,#0

MOV A,KEYSCAN

MOV P3,A

NOP

MOV A,P3

ANL A,#0FH

XRL A,#0FH

JZ NOKEY

MOV R2,#10

LCALL DELAY

MOV A,P3

ANL A,#0FH

XRL A,#0FH

JZ NOKEY

MOV A,P3

ANL A,#0FH

MOV R7,A

SF:

MOV A,P3

ANL A,#0FH

XRL A,#0FH

JNZ SF

MOV A,R7

CJNE A,#0EH,NK1

MOV KEYTM,#1

SJMP NOKEY

NK1:

CJNE A,#0DH,NK2

MOV KEYTM,#2

SJMP NOKEY

NK2:

CJNE A,#0BH,NK3

MOV KEYTM,#3

SJMP NOKEY

NK3:

CJNE A,#07H,NOKEY

MOV KEYTM,#4

NOKEY: RET

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

DELAY:

MOV R3,#50

DELAY1:

MOV R4,#100

DJNZ R4,$

DJNZ R3,DELAY1

DJNZ R2,DELAY

RET

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

T0ISR:

PUSH ACC

CLR TR0

MOV TH0,#0D8H

MOV TL0,#0F0H

SETB TR0

MOV DPTR,#LEDTAB

T000: ;数字显示

MOV R0,#DAT

MOV A,SCANLED

ADD A,R0

MOV R0,A

MOV A,SCANLED

JNZ T001

MOV P2,#01H

SJMP T0DIS

T001:

DEC A

JNZ T002

MOV P2,#02H

SJMP T0DIS

T002:

DEC A

JNZ T003

MOV P2,#04H

SJMP T0DIS

T003:

MOV P2,#08H

T0DIS:

MOV A,@R0

MOVC A,@A+DPTR

; CPL A

MOV P0,A

INC SCANLED

MOV A,SCANLED

ANL A,#03H

MOV SCANLED,A

POP ACC

RETI

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

CHGKEY:

MOV A,KEYVAL

JZ KV16

DEC A

JNZ KV01

MOV KEYVAL,#7

RET

KV01:

DEC A

JNZ KV02

MOV KEYVAL,#4

RET

KV02:

DEC A

JNZ KV03

MOV KEYVAL,#1

RET

KV03:

DEC A

JNZ KV04

MOV KEYVAL,#10

RET

KV04:

DEC A

JNZ KV05

MOV KEYVAL,#8

RET

KV05:

DEC A

JNZ KV06

MOV KEYVAL,#5

RET

KV06:

DEC A

JNZ KV07

MOV KEYVAL,#2

RET

KV07:

DEC A

JNZ KV08

MOV KEYVAL,#0

RET

KV08:

DEC A

JNZ KV09

MOV KEYVAL,#9

RET

KV09:

DEC A

JNZ KV10

MOV KEYVAL,#6

RET

KV10:

DEC A

JNZ KV11

MOV KEYVAL,#3

RET

KV11:

DEC A

JNZ KV12

MOV KEYVAL,#11 ;=

RET

KV12:

DEC A

JNZ KV13

MOV KEYVAL,#12 ;/

RET

KV13:

DEC A

JNZ KV14

MOV KEYVAL,#13 ;*

RET

KV14:

DEC A

JNZ KV15

MOV KEYVAL,#14 ;-

RET

KV15:

DEC A

JNZ KV16

MOV KEYVAL,#15 ;+

RET

KV16:

MOV KEYVAL,#0FFH

RET

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

LEDTAB:

DB 0C0H ;"0" 00H

DB 0F9H ;"1" 01H

DB 0A4H ;"2" 02H

DB 0B0H ;"3" 03H

DB 99H ;"4" 04H

DB 92H ;"5" 05H

DB 82H ;"6" 06H

DB 0F8H ;"7" 07H

DB 80H ;"8" 08H

DB 90H ;"9" 09H

DB 88H ;"A" 0AH

DB 83H ;"B" 0BH

DB 0C6H ;"C" 0CH

DB 0A1H ;"D" 0DH

DB 86H ;"E" 0EH

DB 8EH ;"F" 0FH

DB 0FFH ;" " 10H

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

END

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