单片机2位加减乘除(参考实验范例)

first_ge equ 60h ;伪指令first_shi equ 61hsecond_ge equ 62hsecond_shi equ 63hresult_ge equ 64hresult_shi equ 65hresult_bai equ 66hresult_qian equ 67hal equ 68hp_can bit 40hc_can bit 41hover bit 42horg 0000hljmp startorg 0050hstart:mov first_ge,#0mov first_shi,#0mov second_ge,#0mov second_shi,#0mov al,#5mov result_ge,#0mov result_shi,#0mov result_bai,#0mov result_qian,#0mov 45h,#0mov 46h,#0mov 35h,#0mov 36h,#0mov 37h,#0mov 38h,#0clr p_canclr c_canclr overmov 10h,#0main: lcall xianshimov p0,#0f0hmov a,p0cjne a,#0f0h,next ;判断是否有键按下ljmp mainnext: lcall delay ;延时去斗mov p0,#0f0hmov a,p0cjne a,#0f0h,key_num ;确定有键按下ljmp mainlcall xianshikey_num:mov p0,#0f0h ;取键值mov a,p0mov 20h,amov p0,#0fhmov a,p0add a,20hmov 10h,await: mov P0,#0f0h ;等键放开mov a,P0cjne a,#0f0h,waitmov a,10hlcall displaylcall xianshiljmp main;============================== display: ;判断键值cjne a,#0eeh,next1ljmp display0next1:cjne a,#0edh,next2ljmp display1next2:cjne a,#0ebh,next3ljmp display2next3:cjne a,#0e7h,next4ljmp display3next4:cjne a,#0deh,next5ljmp display4next5:cjne a,#0ddh,next6ljmp display5next6:cjne a,#0dbh,next7ljmp display6next7:cjne a,#0d7h,next8ljmp display7next8:cjne a,#0beh,next9ljmp display8next9:cjne a,#0bdh,nextaljmp display9nexta:cjne a,#0bbh,nextbljmp displayanextb:cjne a,#0b7h,nextcljmp displaybnextc:cjne a,#7eh,nextdljmp displaycnextd:cjne a,#7dh,nexteljmp displaydnexte:cjne a,#7bh,nextfljmp displayenextf:cjne a,#77h,wrongljmp displayfwrong:ret;===================================display0: ;1jb c_can,d_0_0jb p_can,d_0_1mov first_ge,#1setb p_canretd_0_1: mov 61h , 60hmov 60h,#1retd_0_0:jb p_can,d_0_2mov second_ge,#1setb p_canretd_0_2:mov 63h , 62hmov 62h,#1retdisplay1: ;4jb c_can,d_1_0jb p_can,d_1_1mov first_ge,#4setb p_canretd_1_1: mov 61h , 60hmov 60h,#4retd_1_0:jb p_can,d_1_2mov second_ge ,#4setb p_canretd_1_2: mov 63h , 62hmov 62h,#4retdisplay2: ;7jb c_can,d_2_0jb p_can,d_2_1mov first_ge,#7setb p_canretd_2_1: mov 61h , 60hmov 60h,#7retd_2_0:jb p_can,d_2_2mov second_ge,#7setb p_canretd_2_2:mov 63h , 62hmov 62h,#7setb p_canretdisplay3: ;clrmov first_ge,#0mov first_shi,#0mov second_ge,#0mov second_shi,#0mov al,#5mov result_ge,#0mov result_shi,#0mov result_bai,#0mov result_qian,#0mov 45h,#0mov 46h,#0mov 35h,#0mov 36h,#0mov 37h,#0mov 38h,#0clr p_canclr c_canclr overmov 10h,#0retdisplay4: ;2jb c_can,d_4_0jb p_can,d_4_1mov first_ge,#2setb p_canretd_4_1: mov 61h , 60hmov 60h,#2retd_4_0:jb p_can,d_4_2mov second_ge,#2setb p_canretd_4_2:mov 63h , 62hmov 62h,#2setb p_canretdisplay5: ;5jb c_can,d_5_0jb p_can,d_5_1mov first_ge,#5setb p_canretd_5_1: mov 61h , 60hmov 60h,#5retd_5_0: jb p_can,d_5_2mov second_ge,#5setb p_canretd_5_2:mov 63h , 62hmov 62h,#5setb p_canretdisplay6: ;8jb c_can,d_6_0jb p_can,d_6_1mov first_ge,#8setb p_canretd_6_1: mov 61h , 60hmov 60h,#8retd_6_0:jb p_can,d_6_2mov second_ge,#8setb p_canretmov 62h,#8setb p_canretdisplay7: ;0jb c_can,d_7_0jb p_can,d_7_1mov first_ge,#0setb p_canretd_7_1: mov 61h , 60hmov 60h,#0retd_7_0:jb p_can,d_7_2mov second_ge,#0setb p_canretd_7_2:mov 63h , 62hmov 62h,#0setb p_canretdisplay8: ;3jb c_can,d_8_0jb p_can,d_8_1mov first_ge,#3setb p_canretd_8_1: mov 61h , 60hmov 60h,#3retd_8_0:jb p_can,d_8_2mov second_ge,#3setb p_canretd_8_2:mov 63h , 62hmov 62h,#3setb p_canretdisplay9: ;6jb c_can,d_9_0jb p_can,d_9_1mov first_ge,#6setb p_canretmov 60h,#6retd_9_0:jb p_can,d_9_2mov second_ge,#6setb p_canretd_9_2:mov 63h , 62hmov 62h,#6setb p_canretdisplaya: ;9jb c_can,d_a_0jb p_can,d_a_1mov first_ge,#9setb p_canretd_a_1: mov 61h , 60hmov 60h,#9retd_a_0:jb p_can,d_a_2mov second_ge,#9setb p_canretd_a_2:mov 63h , 62hmov 62h,#9setb p_canretdisplayb: ;=setb overmov a,al;````````````````cjne a,#0,d_b_0 ;加法程序mov a,first_shiswap aorl a,first_gemov 45h,amov a,second_shiswap aorl a,second_geadd a,45hda ajnc bai_no_addmov result_bai,#1bai_no_add:mov 46h,aanl a,#0fhmov result_ge,amov a,46hanl a,#0f0hswap amov result_shi,aret;``````````````````````````````d_b_0:cjne a,#1,d_b_1 ;减法程序mov a,first_shiswap aorl a,first_gemov 45h,amov a,second_shiswap aorl a,second_gemov 46h,amov a,#9ah ;取补码9ahsubb a,46hadd a,45hda amov 46h,aanl a,#0fhmov result_ge,amov a,46hanl a,#0f0hswap amov result_shi,aret;``````````````````d_b_1:cjne a,#2,tiao ;乘法程序sjmp chengtiao:ljmp d_b_2;-----------------;十进制个位与个位相乘cheng:mov a,first_gemov b,second_gemul ab ;结果不大于81，存放于a中mov b,#10div ab ;十位数存于a，个位数存于bmov result_ge,b ;求出个位数mov 35h,a ;存十位寄35h;-----------------;个位与十位相乘mov a,first_shimov b,second_gemul abmov b,#10div abmov 36h,a ; 存百位寄存36hmov a,badd a,35hmov 35h,a ;clr csubb a,#10jc bai_no_jin_1inc 36h;如有进位，加一mov 35h,abai_no_jin_1:mov a,36hclr csubb a,#10jc qian_no_jin_1inc 37hmov 36h,aqian_no_jin_1: ;----------------------;十位与个位相乘mov a,first_gemov b,second_shimul abmov b,#10div abmov 33h,a ;结果寄放clr cmov a,badd a,35hmov 35h,a ;十位处理clr csubb a,#10jc bai_no_jin_2inc 36hmov 35h,abai_no_jin_2:mov a,33hadd a,36hmov 36h,a ;百位处理clr csubb a,#10 ;千位处理jc qian_no_jin_2inc 37hmov 36h,aqian_no_jin_2:;--------------------------;十位与十位相乘mov a,first_shimov b,second_shimul abmov b,#10div abmov 33h,aclr cmov a,badd a,36hmov 36h,aclr csubb a,#10jc qian_no_jin_3inc 37hmov 36h,aqian_no_jin_3:mov a,33hadd a,37hmov 37h,a ;--mov result_shi,35hmov result_bai,36hmov result_qian,37hret;```````````````````````````d_b_2:cjne a,#3,d_b_3 ;除法程序mov a,first_shiswap aorl a,first_gemov 45h,a ;第一个bcd码数字存放mov a,second_shiswap aorl a,second_gemov 46h,a ;第二个bcd码数字存放recom:mov a,45hclr csubb a,46hjc xiaomov a,#9ahsubb a,46hadd a,45hda amov 45h,ainc 38hjmp recomxiao:mov a,38hmov b,#10div abmov result_shi,amov result_ge,bret;d_b_3:retdisplayc: ;+mov al,#0setb c_canclr p_canretdisplayd: ;-mov al,#1setb c_canclr p_canretdisplaye: ;*mov al,#2setb c_canclr p_canretdisplayf: ;/mov al,#3setb c_canclr p_canret;========================delay:mov r7,#10loop0:mov r6,#08fhloop1:djnz r6,loop1djnz r7,loop0ret ;===================================xianshi:mov dptr,#TABjb over,over_loopjb c_can,c_loopmov a,first_ge ;显示第一个数movc a,@a+dptrmov P1,amov P2,#0fehlcall delaymov P1,#0ffhmov P2,#0ffhmovc a,@a+dptrmov P1,amov P2,#0fdhlcall delaymov P1,#0ffhmov P2,#0ffhret;-----------------------;显示第二个数c_loop:mov a,second_gemovc a,@a+dptrmov P1,amov P2,#0fehlcall delaymov P1,#0ffhmov P2,#0ffhmov a,second_shimovc a,@a+dptrmov P1,amov P2,#0fdhlcall delaymov P1,#0ffhmov P2,#0ffhretover_loop: ;显示运算结果mov a,result_gemovc a,@a+dptrmov P1,amov P2,#0fehlcall delaymov P1,#0ffhmov P2,#0ffhmov a,result_shimovc a,@a+dptrmov P1,amov P2,#0fdhlcall delaymov P1,#0ffhmov P2,#0ffhmov a,result_baimovc a,@a+dptrmov P1,amov P2,#0fbhlcall delaymov P2,#0ffhmov a,result_qianmovc a,@a+dptrmov P1,amov P2,#0f7hlcall delaymov P1,#0ffhmov P2,#0ffhretTAB: DB 0C0H,0F9H,0A4H,0B0H,99H ;0,1,2,3,4, DB 92H,82H,0F8H,80H,90H ;5,6,7,8,9,DB 88H,83H,0C6H,0A1H,86H ;A,B,C,D,E,DB 8EH;f。