16F876控制的電動自行車驅(qū)動系統(tǒng)源程序

16F876控制的電動自行車驅(qū)動系統(tǒng)源程序

16F876控制的電動自行車驅(qū)動系統(tǒng)源程序，注解特別詳細 ，感謝無名大俠，致敬吧各位.rar

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*???????? 16F876控制的電動自行車驅(qū)動系統(tǒng)源程序??????????? *
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???????※※※※※※※※※※※※※※※※※
???????※資料提供：上海齊濟電子有限公司※
???????※聯(lián)系電話：21-65630199???????? ※
???????※※※※※※※※※※※※※※※※※

16F876控制的電動自行車驅(qū)動系統(tǒng)源程序，注解特別詳細

感謝無名大俠，致敬吧各位

LIST?? P=16F876
?? #INCLUDE P16F876.INC
；以下采用塊定義的方法定義單片機內(nèi)部寄存器
?? CBLOCK?? 0X20?????????????? ；自定義寄存器從0X20開始
?? FLAG1????????????????? ；FLAG1作為標志寄存器
?? VOLTAGEH?????????????? ；電池電壓高位寄存器
?? VOLTAGEL?????????????? ；電池電壓低位寄存器
?? TSH???????????????????? ；手柄電壓高位寄存器
?? TSL???????????????????? ；手柄電壓低位寄存器
?? STATE1????????????????? ；霍爾信號采樣暫存器1
?? STATE2????????????????? ；霍爾信號采樣暫存器2
STATE3????????????????? ；霍爾信號采樣暫存器3
?? DELAY????????????????? ；延時計數(shù)器
?? COUNT_VOL?????????????? ；低電壓采樣次數(shù)計數(shù)器
?? ACCaLO?????????????????? ；ACCa~ACCd為運算用的寄存器
?? ACCaHI??????
?? ACCbLO??????
?? ACCbHI??????
?? ACCcLO??????
?? ACCcHI??????
?? ACCdLO??????
?? ACCdHI??????
?? TEMP?????????????????? ；臨時寄存器
?? TEMP1?????????????????? ；臨時寄存器（中斷用）
?? SIGN?????????????????? ；符號寄存器
?? COUNT?????????????????? ；臨時寄存器
?? W_STACK????????????????? ；中斷時用于暫存W寄存器值
?? ST_STACK????????????????? ；中斷時用于暫存STATUS寄存器值
?? ENDC
；***********標志寄存器位定義以及程序中常數(shù)定義***********
?? CONSTANT?? VOLTAGE=0????? ；采電池電壓標志位
?? CONSTANT?? PWM=1???????? ；輸出下一次PWM信號標志位
?? CONSTANT?? LOWPOWER=2????? ；低電壓標志位
?? CONSTANT?? SHUTDOWN=3????? ；剎車標志位
?? CONSTANT?? OFF=4???????? ；復位標志位
CONSTANT?? AND=0XE0????? ；AND用于獲取有效霍爾信號
?? CONSTANT?? FULLPWM=0XFF?? ；當PWM輸出全高時，輸入CCPR1L中的值
?? CONSTANT?? VOLOFFH=0X02?? ；當電池電壓低于24AH時, 低壓保護2.86 V/31.5 V
?? CONSTANT?? VOLOFFL=0X4A
CONSTANT?? VOLONH=0X02????? ；當電池電壓大于266H時，允許電機重開3V/33V
?? CONSTANT?? VOLONL=0X66
?? CONSTANT?? TSONH=0X01????? ；剎車后手柄復位值低于133H，則允許電機重新啟動
?? CONSTANT?? TSONL=0X33
；***復位矢量入口（單片機復位時，PC指針指向程序存儲器0X0000單元）***
????? ORG????? 0X0000
START?? GOTO?? MAIN???????? ；復位后程序進入主程序
；***中斷矢量入口程序（PIC單片機的中斷矢量入口為0X0004）***
????? ORG????? 0X0004???????? ；中斷矢量入口
????? BTFSC?? INTCON，RBIF????? ；是否為RB口電平變化中斷？??
????? GOTO?? SAMPLERB????? ；是，進入RB口電平變化中斷服務程序
????? BTFSC?? PIR1，ADIF????? ；是否為AD采樣中斷
????? GOTO?? AD??????????? ；是，進入AD中斷服務程序
????? BTFSC?? INTCON，INTF????? ；是否為剎車中斷
????? GOTO?? BRAKE???????? ；是，剎車中斷處理
????? RETFIE?????????????? ；如都不是，則中斷返回
；************逆變橋輸出控制表*************
；逆變橋輸出控制表，其輸出對應6種狀態(tài)，霍爾信號來自B口RB7、RB6、RB5，C口輸出低電平有
；效，其中RC1，RC2不作為觸發(fā)電路輸出口，故表中使其為高電平
ORG????? 0X0020???????? ；表程序從0X0020單元開始存放（也可以不從這開始）
OUT_TABLE???????????
????? ADDWF?? PCL，1
????? RETLW?? 0X0AF???????? ；如霍爾信號為0、0、0，則使RC4、RC6為低電平
????? RETLW?? 0X0BE???????? ；如霍爾信號為0、0、1，則使RC0、RC6為低電平
????? RETLW?? 0X0FF???????? ；沒有為0、1、0的霍爾信號對應電機狀態(tài)
????? RETLW?? 0X07E???????? ；如霍爾信號為0、1、1，則使RC0、RC7為低電平
????? RETLW?? 0X0CF???????? ；如霍爾信號為1、0、0，則使RC4、RC5為低電平
????? RETLW?? 0X0FF???????? ；沒有為1、0、1的霍爾信號對應電機狀態(tài)
????? RETLW?? 0X0D7???????? ；如霍爾信號為1、1、0則使RC3、RC5為低電平
????? RETLW?? 0X077???????? ；如霍爾信號為1、1、1則使RC3、RC7為低電平
；***************主程序*****************
????? ORG?? 0X0100??????????? ；主程序從0X0100單元開始存儲
MAIN??
????? MOVLW?? 0X0FF???????? ；由于C口上電復位值不確定，必須先關(guān)閉所有MOS管
????? MOVWF?? PORTC
????? BSF????? STATUS，RP0????? ；選擇存儲體1
????? MOVLW?? 0X02??????????? ；設(shè)置RC1為輸入口，其它為輸出口，其中RC2為PWM?
????? MOVWF?? TRISC???????? ；輸出口，其它位為觸發(fā)信號輸出
????? BCF????? STATUS，RP0????? ；選擇存儲體0
????? CLRF?? PIR1??????????? ；清所有中斷標志位
????? CLRF?? INTCON???????? ；禁止所有中斷
????? MOVLW?? 0X01??????????? ；設(shè)置TMR2預分頻值為4
????? MOVWF?? T2CON
????? MOVLW?? FULLPWM????? ；初始化PWM工作循環(huán)寄存器，使PWM占空比為1
????? MOVWF?? CCPR1L???????? ；輸出電壓為零
????? MOVLW?? 0XFF??????????? ；設(shè)置CCP1工作于PWM方式
????? MOVWF?? CCP1CON
????? MOVLW?? 0X0B??????????? ；CCP2工作于特殊事件觸發(fā)方式，用作AD采樣周期寄存????? MOVWF?? CCP2CON???????? ；器
????? MOVLW?? 0X081???????? ；選擇AD轉(zhuǎn)換時鐘為32分頻，選擇AN0通道，并使AD
????? MOVWF?? ADCON0???????? ；轉(zhuǎn)換允許
????? CLRF?? TMR2???????? ；TMR2計數(shù)器清零
????? CLRF?? TMR1H???????? ；TMR1計數(shù)器清零
????? CLRF?? TMR1L
????? CLRF?? T1CON???????? ；TMR1預分頻為1，關(guān)閉振蕩器，工作于定時工作方式
????? MOVLW?? 0X08??????????? ；初始化AD采樣周期寄存器，T=512 μs
????? MOVWF?? CCPR2H
????? MOVLW?? 0X00
????? MOVWF?? CCPR2L
????? BSF????? STATUS，RP0????? ；選擇存儲體1
????? MOVLW?? 0XEF??????????? ；RB口高3位用于采樣霍爾信號，RB0為剎車中斷,設(shè)置為
????? MOVWF?? TRISB???????? ；輸入，其它未用
????? MOVLW?? 0XC7??????????? ；初始化PWM頻率為5 kHz
????? MOVWF?? PR2?????
????? MOVLW?? 0X082???????? ；AD采樣結(jié)果右移，RA口引腳均為模擬輸入
????? MOVWF?? ADCON1
????? BSF?? OPTION_REG，INTEDG??? ；選擇INT在下降沿產(chǎn)生中斷
????? BCF????? STATUS，RP0
????? CALL?? SAMPLE???????? ；確定當前轉(zhuǎn)子位置
????? CALL?? OUTPUT???????? ；根據(jù)采得的狀態(tài)值觸發(fā)相應的MOSFET
????? MOVLW?? 0X0D8???????? ；開總中斷、外圍中斷、INT中斷和RB口電平變化中斷允
????? MOVWF?? INTCON???????? ；許
BCF????? PIE2，CCP2IE????? ；CCP2中斷禁止
????? BSF????? PIE1，ADIE????? ；打開AD采樣中斷
????? CLRF?? FLAG1???????? ；清標志位寄存器
????? CLRF?? COUNT_VOL????? ；清電池電壓采樣計數(shù)器
????? BSF????? T1CON，TMR1ON?? ；開CCP2，對手柄進行等間隔采樣
????? BSF????? T2CON，TMR2ON?? ；開CCP1
RETEST?? BTFSS?? FLAG1，PWM????? ；TS采樣完畢?
????? GOTO?? NEXT1???????? ；沒有，轉(zhuǎn)NEXT1
????? CALL?? OUT_PWM????? ；TS采樣完畢，送出相應的PWM信號
????? BCF????? FLAG1，PWM????? ；清PWM允許標志
NEXT1?? BTFSS?? FLAG1，LOWPOWER；電壓采樣完畢？
????? GOTO?? NEXT2???????? ；沒有轉(zhuǎn)NEXT2
????? CALL?? POWER???????? ；是，調(diào)用電壓保護子程序處理數(shù)據(jù)
????? BTFSC?? FLAG1，OFF????? ；是否需要復位？
????? GOTO?? MAIN???????? ；是，單片機復位
NEXT2?? BTFSS?? FLAG1，SHUTDOWN；剎車中斷到來？
????? GOTO?? RETEST???????? ；否，回轉(zhuǎn)RETEST
????? CALL?? BRAKEON???????? ；是，調(diào)用剎車處理子程序
????? CLRWDT
????? BTFSC?? FLAG1，OFF????? ；OFF=0？
????? GOTO?? MAIN???????? ；否，單片機復位
????? GOTO?? RETEST???????? ；是，回轉(zhuǎn)RETEST
；***************剎車處理子程序******************
BRAKEON????? BCF????? FLAG1，OFF?? ；清復位標志
????? BCF????? FLAG1，SHUTDOWN；是，清相應標志位
????? BTFSS?? PORTB，0???????? ；INT引腳仍為1？
????? RETURN?????????????? ；否，中斷是由干擾引起的，返回
????? BSF????? STATUS，RP0
????? BCF????? PIE1，ADIE????? ；禁止AD采樣中斷
????? BCF????? STATUS，RP0
????? BCF????? INTCON，INTE????? ；關(guān)RB0中斷
????? MOVLW?? FULLPWM????? ；PWM輸出全高
????? MOVWF?? CCPR1L
????? BCF????? T1CON，TMR1ON?? ；關(guān)閉手柄采樣
BREAK2?? BTFSC?? ADCON0，GO????? ；正在進行AD采樣？
????? GOTO?? BREAK2???????? ；是，等待AD采樣完畢
????? BCF????? ADCON0，CHS0
????? BCF????? ADCON0，CHS1?? ；選擇0采樣通道，準備采樣手柄電壓
????? BCF????? PIR1，ADIF????? ；清AD采樣中斷標志位
????? MOVLW?? 0X06??????????? ；延時
????? MOVWF?? COUNT
BREAK3?? DECFSZ?? COUNT
????? GOTO?? BREAK3
BREAK5?? BSF????? ADCON0，GO????? ；采樣TS值
BREAK4?? BTFSS?? PIR1，ADIF????? ；采樣完畢？
????? GOTO?? BREAK4
????? BCF????? PIR1，ADIF
????? BCF????? STATUS，C??
????? MOVF?? ADRESH，0????? ；當前TS值送被減數(shù)
????? MOVWF?? ACCbHI
????? BSF????? STATUS，RP0
????? MOVF?? ADRESL，0
????? BCF????? STATUS，RP0
????? MOVWF?? ACCbLO
????? MOVLW?? TSONH???????? ；1.5 V所對應的采樣值送減數(shù)
????? MOVWF?? ACCaHI
????? MOVLW?? TSONL
????? MOVWF?? ACCaLO
????? CALL?? D_sub???????? ；當前TS值減1.5V
????? MOVLW?? FULLPWM
????? MOVWF?? CCPR1L
????? CLRWDT
????? BTFSS?? ACCbHI，7????? ；當前電壓值大于1.5V？
????? GOTO?? BREAK5???????? ；是，重新采樣
????? BTFSC?? PORTB，0
????? GOTO?? BREAK5
????? BSF????? FLAG1，OFF????? ；否，置相應的標志位
????? RETURN?????????????? ；返回??
；***************開環(huán)PWM輸出子程序****************
OUT_PWM?? BCF????? FLAG1，PWM?? ；清相應的標志位
????? MOVF?? TSH，0???????? ；將調(diào)速手柄采樣值送至被加數(shù)
????? MOVWF?? ACCaHI
????? MOVF?? TSL，0
????? MOVWF?? ACCaLO
????? MOVLW?? 0XFF??????????? ；FF1F補碼為0XE1，即1.1 V
????? MOVWF?? ACCbHI
????? MOVLW?? 0X1F????????
????? MOVWF?? ACCbLO
????? CALL?? D_add
????? BTFSS?? ACCbHI，7????? ；TS>1.1V?
????? GOTO?? PWM1???????? ；是，轉(zhuǎn)PWM1
????? MOVLW?? FULLPWM????? ；否則輸出全高
????? MOVWF?? CCPR1L
????? RETURN
PWM1?? MOVLW?? 0XFD???????? ；0X27B=3.1V
????? MOVWF?? ACCbHI
????? MOVLW?? 0X85
????? MOVWF?? ACCbLO
????? CALL?? D_add
????? BTFSC?? ACCbHI，7????? ；TS>3.1V?
????? GOTO?? PWM3
PWM2?? CLRF?? CCPR1L
????? BCF????? CCP1CON，4
????? BCF????? CCP1CON，5
????? RETURN
PWM3?? MOVLW?? 0X0FF???????? ；1.1 V對應的采樣值補碼送加數(shù)??
????? MOVWF?? ACCbHI????????
????? MOVLW?? 0X1F
????? MOVWF?? ACCbLO
????? CALL?? D_add???????? ；TS-1.1V
????? CLRF?? ACCaHI???????? ；系數(shù)K=56=38H送乘數(shù)
????? MOVLW?? 0X3F
????? MOVWF?? ACCaLO
????? CALL?? D_mpy???????? ；得到放大128倍的低電平時間K*（TS-1.1V）
????? MOVF?? ACCcHI，0????? ；將結(jié)果取出
????? MOVWF?? ACCaHI
????? MOVF?? ACCcLO，0
????? MOVWF?? ACCaLO??
????? MOVLW?? 0X64??????????? ；PWM周期T減去低電平時間，得到高電平時間
????? MOVWF?? ACCbHI
????? CLRF?? ACCbLO
????? CALL?? D_sub????????
????? BTFSC?? ACCbHI，7????? ；低電平時間是否大于周期？
????? GOTO?? PWM2???????? ；是，輸出全壓
????? RLF????? ACCbLO???????? ；否則，輸出與低電平時間對應的高電平時間
????? RLF????? ACCbHI
????? MOVF?? ACCbHI，0????? ；D10～D2位送CCPR1L
????? MOVWF?? CCPR1L
????? BCF????? CCP1CON，5????? ；D0位送CCP1CON5
????? BTFSC?? ACCbLO，7
????? BSF????? CCP1CON，5
????? BCF????? CCP1CON，4????? ；D.1位送CCP1CON4?????
????? BTFSC?? ACCbLO，6
????? BSF????? CCP1CON，4
????? RETURN?????????????? ；返回
；****************剎車中斷服務程序***************
BRAKE?? CALL?? PUSH???????? ；保存現(xiàn)場
????? BCF????? STATUS，RP0????? ；回存儲區(qū)0
????? BSF????? FLAG1，SHUTDOWN；置相應標志位
????? BCF????? INTCON，INTF????? ；清中斷標志位
????? CALL?? POP??????????? ；恢復現(xiàn)場
????? RETFIE?????????????? ；中斷返回
；***************低電壓保護處理子程序*****************
POWER?? BCF????? FLAG1，LOWPOWER；清相應的標志位
????? MOVF?? VOLTAGEH，0
????? MOVWF?? ACCaHI
????? MOVF?? VOLTAGEL，0
????? MOVWF?? ACCaLO
????? MOVLW?? VOLOFFH
????? MOVWF?? ACCbHI
????? MOVLW?? VOLOFFL
????? MOVWF?? ACCbLO
????? CALL?? D_sub
????? BTFSC?? ACCbLO，7????? ；判斷當前電池電壓值是否低于保護電壓（32V）
????? RETURN?????????????? ；不是，返回
????? BCF????? INTCON，INTE
????? BCF????? T1CON，TMR1ON?? ；關(guān)閉電流采樣
????? MOVLW?? FULLPWM
????? MOVWF?? CCPR1L
????? BSF????? STATUS，RP0
????? BCF????? PIE1，ADIE????? ；禁止AD采樣中斷
????? BCF????? STATUS，RP0
POWER3?? BTFSC?? ADCON0，GO????? ；正在進行AD采樣？
????? GOTO?? POWER3???????? ；是，等待AD采樣完畢
????? BCF????? PIR1，ADIF????? ；清AD采樣中斷標志位
????? BCF????? ADCON0，CHS0
????? BSF????? ADCON0，CHS1?? ；選擇電壓采樣通道
????? MOVLW?? 0X06??????????? ；延時等待通道轉(zhuǎn)換完成
????? MOVWF?? COUNT
POWER4?? DECFSZ?? COUNT
????? GOTO?? POWER4
POWER6?? BSF????? ADCON0，GO????? ；采樣電池電壓值
POWER5?? BTFSS?? PIR1，ADIF????? ；采樣完畢？
????? GOTO?? POWER5
????? BCF????? PIR1，ADIF????? ；清AD中斷標志位
????? BCF????? STATUS，C
????? MOVF?? ADRESH，0????? ；當前電壓值送被加數(shù)
????? MOVWF?? ACCbHI
????? BSF????? STATUS，RP0
????? MOVF?? ADRESL，0
????? BCF????? STATUS，RP0
????? MOVWF?? ACCbLO
????? MOVLW?? VOLONH???????? ；35V電壓值送被加數(shù)
????? MOVWF?? ACCaHI
????? MOVLW?? VOLONL
????? MOVWF?? ACCaLO
????? CALL?? D_sub???????? ；當前電壓值減35，與重開電壓進行比較
????? MOVLW?? FULLPWM
????? MOVWF?? CCPR1L
????? CLRWDT
????? BTFSC?? ACCbHI，7????? ；當前電壓值大于35？
????? GOTO?? POWER6???????? ；否，重新采樣
????? BSF????? FLAG1，OFF????? ；是，置相應的標志位
????? RETURN?????????????? ；返回
；***電機轉(zhuǎn)子位置采樣子程序，狀態(tài)采樣子程序，出口地址：STATE1***
SAMPLE?? MOVLW?? AND??????????? ；讀RB口
????? ANDWF?? PORTB，0???????? ；分離出有效信息
????? MOVWF?? STATE1???????? ；暫存狀態(tài)值
????? MOVLW?? 0X08
????? MOVWF?? DELAY
DEL1????? DECFSZ?? DELAY???????? ；延時6 μs????????
????? GOTO?? DEL1
????? MOVLW?? AND??????????? ；讀RB口
????? ANDWF?? PORTB，0???????? ；分離出有效信息，并暫存
????? MOVWF?? STATE2
????? XORWF?? STATE1，0???????? ；與上一次狀態(tài)值相異或
????? BTFSC?? STATUS，Z
????? RETURN?????????????? ；兩個狀態(tài)值相等則返回
????? MOVLW?? 0X06??????????? ；否則延時4 μs
????? MOVWF?? DELAY
DEL2????? DECFSZ?? DELAY
????? GOTO?? DEL2
????? MOVLW?? AND??????????? ；讀RB口
????? ANDWF?? PORTB，0???????? ；提取有效信息并暫存
????? MOVWF?? STATE3
????? XORWF?? STATE1，0???????? ；與第一次狀態(tài)相同嗎？
????? BTFSC?? STATUS，Z
????? RETURN?????????????? ；相同則返回
????? MOVF?? STATE2，0???????? ；否則再與第二次狀態(tài)相比較
????? XORWF?? STATE3，0
????? BTFSS?? STATUS，Z?????
????? GOTO?? SAMPLE???????? ；三次狀態(tài)均不相同則重新采樣
????? MOVF?? STATE2，0???????? ；第三次狀態(tài)與第二次相同，則將正確狀態(tài)賦予STATE1并
????? MOVWF?? STATE1???????? ；返回
????? RETURN
；************** MOSFET觸發(fā)信號輸出子程序**************
OUTPUT?? SWAPF?? STATE1，1???????? ；STATE1寄存器高低半字節(jié)互換
????? BCF????? STATUS，C????? ；清C位，并將STATE1寄存器左移一位
????? RRF????? STATE1，0???????? ；將采樣所得結(jié)果放至W低三位
????? CALL?? OUT_TABLE????? ；查表獲得輸出值
????? MOVWF?? PORTC???????? ；將輸出值輸出至RC口
????? RETURN
；*************** RB口電平變化中斷服務程序**************
SAMPRB????? CALL?? PUSH????? ；現(xiàn)場保護
????? BCF????? STATUS，RP0
????? CALL?? SAMPLE???????? ；采樣RB口狀態(tài)
????? CALL?? OUTPUT???????? ；根據(jù)RB口狀態(tài)觸發(fā)相應的MOSFET
????? CALL?? POP??????????? ；恢復現(xiàn)場
????? BCF????? INTCON，RBIF????? ；清RB口電平變化中斷標志
????? RETFIE?????????????? ；中斷返回
；************ AD采樣中斷服務程序***************
AD????? CALL?? PUSH???????? ；保護現(xiàn)場
????? BTFSC?? FLAG1，VOLTAGE?? ；是電壓采樣？
????? GOTO?? SET_VOL???????? ；是，作相應的處理
SET_TS?? BCF????? ADCON0，CHS0?? ；AD采樣值是TS，則選擇1采樣通道
????? INCF????? COUNT_VOL????? ；電壓采樣周期寄存器值加1
????? BTFSS?? STATUS，Z????? ；電壓采樣周期到？
????? GOTO?? AD4
????? BCF????? ADCON0，CHS0?? ；是，選擇2采樣通道
????? BSF????? ADCON0，CHS1
????? BSF????? FLAG1，VOLTAGE?? ；置相應的標志位??
AD4????? BCF????? PIR1，ADIF????? ；清AD中斷標志
????? MOVF?? ADRESH，0????? ；采樣值送寄存器暫存
????? MOVWF?? TSH
????? BSF????? STATUS，RP0
????? MOVF?? ADRESL，0
????? BCF????? STATUS，RP0
????? MOVWF?? TSL
????? BSF????? FLAG1，PWM
????? BTFSS?? FLAG1，VOLTAGE?? ；是否需要進行電壓采樣？
????? GOTO?? AD6
????? MOVLW?? 0X05??????????? ；是，延時后采樣電壓
????? MOVWF?? TEMP1
AD5????? DECFSZ?? TEMP1
????? GOTO?? AD5
????? BSF????? ADCON0，GO
AD6????? CALL?? POP??????????? ；恢復現(xiàn)場，中斷返回
????? RETFIE
SET_VOL????? BCF????? ADCON0，CHS1?? ；如果采樣值為電壓值，則選擇0通道
????? BCF????? ADCON0，CHS0
????? BCF????? PIR1，ADIF????? ；清中斷標志位
????? BCF????? FLAG1，VOLTAGE?? ；清相應標志位
????? MOVF?? ADRESH，0????? ；將采樣結(jié)果放入被減數(shù)寄存器
????? MOVWF?? VOLTAGEH
????? BSF????? STATUS，RP0
????? MOVF?? ADRESL，0
????? BCF????? STATUS，RP0
????? MOVWF?? VOLTAGEL
????? BSF????? FLAG1，LOWPOWER；是，置相應標志位
????? CALL?? POP??????????? ；中斷返回
????? RETFIE
；**************中斷保護現(xiàn)場子程序******************
PUSH?? MOVWF?? W_STACK???????? ；暫存W寄存器
????? MOVF?? STATUS，0????? ；暫存STATUS寄存器
????? MOVWF?? ST_STACK
????? RETURN?????????????? ；子程序返回
；**************中斷恢復現(xiàn)場子程序**************
POP????? MOVF?? ST_STACK，0????? ；恢復STATUS寄存器值
????? MOVWF?? STATUS
????? MOVF?? W_STACK，0????? ；恢復W寄存器值
????? RETURN?????????????? ；子程序返回
；**************初始化子程序****************
SETUP?? MOVLW??? .15??????????? ；初始化TEMP?????
????? MOVWF??? TEMP
????? MOVF??? ACCbHI，0????? ；ACCb送ACCd
????? MOVWF??? ACCdHI
????? MOVF??? ACCbLO，0
????? MOVWF??? ACCdLO
????? CLRF??? ACCbHI???????? ；清ACCb
????? CLRF??? ACCbLO
????? RETLW??? 0
；**********乘除法運算確定結(jié)果符號子程序**********
S_SIGN?? MOVF??? ACCaHI，0????? ；ACCaHI異或ACCbHI，結(jié)果送SIGN單元
????? XORWF??? ACCbHI，0
????? MOVWF??? SIGN????????
????? BTFSS??? ACCbHI，7????? ；ACCb為負？
????? GOTO??? CHEK_A???????? ；否，檢查ACCa
????? CALL?? NEG_B
CHEK_A?? BTFSS??? ACCaHI，7????? ；ACCa為負？
????? RETLW??? 0??????????? ；ACCa和ACCb均為負，返回
????? GOTO??? NEG_A???????? ；ACCa為負，取補
????? GOTO?? MAIN
????? END????????????????? ；程序結(jié)束