程序代码：

 SDA EQU P3.7
LED EQU P0
WEIX EQU P2
WEIS EQU 35H
WEND EQU 36H
ORG 0000H
    LJMP MAIN
ORG 0050H
TAB: DB 0fch,060h,0dah,0f2h,066h,0b6h,0beh,0e0h,0feh,0f6h,0EEH,03EH,09CH,07AH,09EH,08EH
;-------延时-----------
DELAY60:;80
    MOV R7,#50
    DJNZ R7,$
RET
DELAY600:
    MOV R6,#10
DLS:
    MOV R7,#30
    DJNZ R7,$
    DJNZ R6,DLS
RET
DELAY:;等待转换完成
    MOV R5,#10
DELS1:
    MOV R6,#200
DELS:
    MOV R7,#250
    DJNZ R7,$
    DJNZ R6,DELS
LCALL XSWD
    DJNZ R5,DELS1
RET
;-----初始化-------
CSH:
    SETB SDA
    LCALL DELAY60
    CLR SDA
    LCALL DELAY600
    SETB SDA
    LCALL DELAY60
    JB SDA,$
    JNB SDA,$
RET
;------写入字节-------
XZJ:
    MOV WEIS,#08H
XZJS:
    CLR SDA
    RR A
    MOV C,ACC.7
    MOV SDA,C
    LCALL DELAY60
    SETB SDA
    DJNZ WEIS,XZJS
RET
;-------读出字节--------
DZJ:
    MOV WEIS,#08H
DZJS:
    CLR SDA
    RR A
    SETB SDA
    MOV C,SDA
    MOV ACC.7,C
    LCALL DELAY60
    DJNZ WEIS,DZJS
RET
;--------检测温度------------
JCWD:
    MOV A,#0CCH
    LCALL XZJ
    MOV A,#044H
    LCALL XZJ
RET
;---------读取温度-----------
DQWD:
    MOV A,#0CCH
    LCALL XZJ
    MOV A,#0BEH
    LCALL XZJ
    LCALL DZJ
    MOV R0,#WEND
    MOV @R0,A
    LCALL DZJ
    XCHD A,@R0
    MOV A,@R0
    SWAP A
    ;DA A
    MOV @R0,A
RET
;---------显示温度-----------
XSWD:
    MOV DPTR,#TAB
    MOV A,WEND
    ANL A,#0FH
    MOVC A,@A+DPTR
    MOV WEIX,#00H
    MOV LED,A

    LCALL DELAY600

    MOV A,WEND
    ANL A,#0F0H
    SWAP A
    MOVC A,@A+DPTR
    MOV WEIX,#01H
    MOV LED,A
RET
;---------主函数----------
MAIN:
    MOV SP,#3FH
LOOP:
    LCALL JCWD
    LCALL DELAY
    LCALL DQWD
    LJMP LOOP
END