個(gè)是10AD的轉(zhuǎn)換程序;
;入口參數(shù)是原二進(jìn)數(shù),ADRESH,ADRESL,
;出口參數(shù):轉(zhuǎn)換完成數(shù)是存放在,RLT,SOUH,SOU中,
;程序默認(rèn)的是SELECT AN0口
;相當(dāng)于二字節(jié)二進(jìn)制轉(zhuǎn)換成3字節(jié)BCD碼
;
;

    LIST  P=16F877;
    INCLUDE  

TEMP1   EQU    21H;
TEMP2   EQU    22H;
TEMP3   EQU    23H;
CNT     EQU    50H;
SOU     EQU    76H;
SOUH    EQU    77H;
RLT     EQU    78H;
  
BANK3 MACRO                       ;
BSF STATUS,RP0                   ;
BSF STATUS,RP1                   ;
ENDM                             ;
BANK2 MACRO                       ;
BCF STATUS,RP0                   ;
BSF STATUS,RP1                   ;
ENDM                             ;
BANK1 MACRO                       ;
BSF STATUS,RP0                   ;
BCF STATUS,RP1                   ;
ENDM                             ;
BANK0 MACRO                       ;
BCF STATUS,RP0                   ;
BCF STATUS,RP1                   ;
ENDM                             ;

 ORG   0000
    NOP;
    GOTO  AAAA
MIAN
    BANK1;
    MOVLW   B'00000010'          ;左對(duì)齊方式,標(biāo)準(zhǔn),RA全部口為模擬的,RE口為數(shù)字口
    MOVWF   ADCON1               ;
    BANK0                        ;選擇體零
    MOVLW    B'01000001'         ;選擇FOSC/8,允許ADC工作,但還沒(méi)有開(kāi)始轉(zhuǎn)換
    MOVWF    ADCON0              ;
    BSF      ADCON0,GO           ;START ADC GO
    BTFSS    PIR1,ADIF;
    GOTO     $-1;
    MOVF     ADRESH,0;
    MOVWF    SOUH;
    BANK1;
    MOVF     ADRESL,0;
    MOVWF    SOU;
    BANK0;
AAAA

 CLRF     SOU;
    CLRF     SOUH;
    MOVLW    56H;
    MOVWF    SOU;
    MOVLW    3FH;
    MOVWF    SOUH;
    CALL     DBTBCD;
    
    GOTO     $
  

;********************DBTBCD********************
;本程序?qū)崿F(xiàn)雙字節(jié)二進(jìn)制數(shù)轉(zhuǎn)化為3字節(jié)壓縮BCD碼。
;入口參數(shù)：原二進(jìn)制數(shù)在SOUH:SOU中。
;出口參數(shù)：結(jié)果在RLT:SOUH:SOU中。
;占用資源：W,STATUS,FSR,023H,024H,025H,026H,028H,029,02AH,兩重堆棧。

DBTBCD      MOVF        SOU,W
            MOVWF       TEMP2
            MOVF        SOUH,W
            MOVWF       TEMP3
            CLRF        SOU
            CLRF        SOUH
            CLRF        RLT
            BCF         STATUS,C
            MOVLW       .16
            MOVWF       CNT
LOOPC1      RLF         TEMP2,F

  RLF         TEMP3,F
            RLF         SOU,F
            RLF         SOUH,F
            RLF         RLT,F
            DECFSZ      CNT,F
            GOTO        ADJDEC1        
            RETURN           ;整個(gè)子程序結(jié)束
ADJDEC1     MOVLW       SOU
            MOVWF       FSR
            CALL        ADJBCD1     ;調(diào)整RLT
            MOVLW       SOUH
            MOVWF       FSR
            CALL        ADJBCD1     ;調(diào)整RLTH
            MOVLW       RLT
            MOVWF       FSR
            CALL        ADJBCD1     ;調(diào)整TEMP1
            GOTO        LOOPC1
;********************調(diào)整BCD********************

ADJBCD1     MOVLW       03H
            ADDWF       INDF,W      ;低四位加3
            MOVWF       TEMP1       ;暫存
            BTFSC       TEMP1,3     ;結(jié)果大于7,
            MOVWF       INDF        ;則存起來(lái)
            MOVLW       30H
            ADDWF       INDF,W      ;高四位加3
            MOVWF       TEMP1              
            BTFSC       TEMP1,7     ;結(jié)果大于7,
            MOVWF       INDF        ;則存起來(lái)
           RETURN
       END;