LowTemp   equ -50   ; A/D 0
        HighTemp  equ  150    ; A/D 255
        ADPort    equ 0FEF3H
        LEDBuf   equ 30H
        TEMP     EQU 40H
        CURTEMP EQU     60H
	DIN	BIT	P3.4
	CLK	BIT	P3.5

        ORG   0000H
        ljmp  Start
        ORG   0030H

LEDMAP: DB	3FH,6,5BH,4FH,66H,6DH ;0，1，2，3，4，5
	DB	7DH,7,7FH,6FH,77H,7CH ;6，7，8，9，A，B
	DB	58H,5EH,7BH,71H,0,40H ;C，D，E，F， , -
        DB      63H,39H


  ;################################################
DisplayLED:
        MOV	R0,#LEDBUF
	MOV	R1,#TEMP
	MOV	R2,#5
DP10:	MOV	DPTR,#LEDMAP
	MOV	A,@R0
	MOVC	A,@A+DPTR
	MOV	@R1,A
	INC	R0
	INC	R1
	DJNZ	R2,DP10
	MOV	R0,#TEMP
	MOV	R1,#5
DP12:	MOV	R2,#8
	MOV	A,@R0
DP13:	RLC	A
	MOV	DIN,C
	CLR	CLK
	SETB	CLK
	DJNZ	R2,DP13
	INC	R0
	DJNZ	R1,DP12
        RET
; ================================
DisplayResult:
       mov   a, CurTemp
       jnb   acc.7, GE0

       mov   LEDBuf, #11h    ;
       dec   a
       cpl   a
       LJMP   Goon
GE0:
       mov   LEDBuf, #10h  ; ' '
Goon:
       mov   b, #10
       div   ab
       mov   LEDBuf+1, a
       mov   a, b
       mov   LEDBuf+2, a
       mov   LEDBUF+3,#12H
       MOV   LEDBUF+4,#13H
       RET

ReadAD:
       mov   dptr, #ADPort
       clr   a
       movx  @dptr, a       ; start A/D
WAIT:  JNB     P3.3,WAIT
       MOVX  A,@DPTR     ;  讀入結果

       ret
       ;$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
ReadTemp:
       ACALL  ReadAD
       mov   b, #200      ;(HighTemp-LowTemp)
       mul   ab
       mov   a, b             ; /256
       add   a, #LowTemp
       mov   CurTemp, a
       ret

DELAY:MOV   R4,#0FFH
AA1:  MOV   R5,#0FFH
AA:   NOP
      NOP
      DJNZ  R5,AA
      DJNZ  R4,AA1
      RET


Start: ACALL  ReadTemp
       ACALL  DisplayResult
       ACALL  DisplayLED
       ACALL  DELAY
       Ljmp  START

       end