DS18B20数字温度计的设计

p;   MOV C , TEMPDIN
                  MOV R6 , #3CH
                  DJNZ R6 , $
RRC A
SETB TEMPDIN
DJNZ R7 ,READDS1820LOOP
MOV R6 , #3CH
DJNZ    R6 , $
RET
WRITEDS1820:     MOV R7 ,#08H
      SETB TEMPDIN
        NOP
         NOP
WRITEDS1820LOP: CLR TEMPDIN
     MOV R6 ,#07H
    DJNZ R6, $
    RRC A
    MOV TEMPDIN
          DJNZ R7 , WRITEDS1820LOP
     RET
READTEMP:   LCALL INITDS1820
   MOV A ,#0CCH
LCALL WRITEDS1820
    MOV R6 ,# 34H
              DJNZ R6 ,$
         MOV A , #44H
LCALL WRITEDS1820
   MOV R6 ,# 34H
   DJNZ R6 ,$
    RET
READTEMP1: LCALL INITDS1820
MOV A , #0CCH
    LCALL WRITEDS1820
     MOV R6 , #34H
DJNZ R6 , $
   MOV A , #0BEH
LCALL WRITEDS1820
    MOV R6 , #34H
DJNZ R6 , $
MOV R5 , #09H
MOV B , #00H
READTEMP2: LCALL READDS1820
               MOV @R0 , A
               INC R0
READTEMP21: LCALL CRC8CAL
               DJNZ R5 , READTEMP2
              MOV A , B
              JNZ READTEMPOUT
              MOV A , TEMPHEAD +0
              MOV TEMPL , A
              MOV A , TEMPHEAD +1
READTEMPOUT: RET
CONVEMP: MOV A , TEMPH
           ANL A , #80H
           JZ TEMPC1
           CLR C
           MOV A , TEMPL
           CLP A
           ADD A

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DS18B20数字温度计的设计(六)