单片机2位加减乘除(参考实验范例)
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first_ge equ 60h ;伪指令
first_shi equ 61h
second_ge equ 62h
second_shi equ 63h
result_ge equ 64h
result_shi equ 65h
result_bai equ 66h
result_qian equ 67h
al equ 68h
p_can bit 40h
c_can bit 41h
over bit 42h
org 0000h
ljmp start
org 0050h
start:mov first_ge,#0
mov first_shi,#0
mov second_ge,#0
mov second_shi,#0
mov al,#5
mov result_ge,#0
mov result_shi,#0
mov result_bai,#0
mov result_qian,#0
mov 45h,#0
mov 46h,#0
mov 35h,#0
mov 36h,#0
mov 37h,#0
mov 38h,#0
clr p_can
clr c_can
clr over
mov 10h,#0
main: lcall xianshi
mov p0,#0f0h
mov a,p0
cjne a,#0f0h,next ;判断是否有键按下
ljmp main
next: lcall delay ;延时去斗
mov p0,#0f0h
mov a,p0
cjne a,#0f0h,key_num ;确定有键按下
ljmp main
lcall xianshi
key_num:
mov p0,#0f0h ;取键值
mov a,p0
mov 20h,a
mov p0,#0fh
mov a,p0
add a,20h
mov 10h,a
wait: mov P0,#0f0h ;等键放开
mov a,P0
cjne a,#0f0h,wait
mov a,10h
lcall display
lcall xianshi
ljmp main
;============================== display: ;判断键值
cjne a,#0eeh,next1
ljmp display0
next1:cjne a,#0edh,next2
ljmp display1
next2:cjne a,#0ebh,next3
ljmp display2
next3:cjne a,#0e7h,next4
ljmp display3
next4:cjne a,#0deh,next5
ljmp display4
next5:cjne a,#0ddh,next6
ljmp display5
next6:cjne a,#0dbh,next7
ljmp display6
next7:cjne a,#0d7h,next8
ljmp display7
next8:cjne a,#0beh,next9
ljmp display8
next9:cjne a,#0bdh,nexta
ljmp display9
nexta:cjne a,#0bbh,nextb
ljmp displaya
nextb:cjne a,#0b7h,nextc
ljmp displayb
nextc:cjne a,#7eh,nextd
ljmp displayc
nextd:cjne a,#7dh,nexte
ljmp displayd
nexte:cjne a,#7bh,nextf
ljmp displaye
nextf:cjne a,#77h,wrong
ljmp displayf
wrong:ret
;===================================
display0: ;1
jb c_can,d_0_0
jb p_can,d_0_1
mov first_ge,#1
setb p_can
ret
d_0_1: mov 61h , 60h
mov 60h,#1
ret
d_0_0:
jb p_can,d_0_2
mov second_ge,#1
setb p_can
ret
d_0_2:mov 63h , 62h
mov 62h,#1
ret
display1: ;4
jb c_can,d_1_0
jb p_can,d_1_1
mov first_ge,#4
setb p_can
ret
d_1_1: mov 61h , 60h
mov 60h,#4
ret
d_1_0:
jb p_can,d_1_2
mov second_ge ,#4
setb p_can
ret