基于DS18B20和上位机显示的数字温度计设计汇编语言

这里提供基于AT89C51单片机的DS18B20数字温度计设计汇编语言的代码，使用串口通信将温度数据发送至上位机进行显示。

$mod51
ORG 0H

MOV P1,#00H
MOV P2,#01H

AGAIN:  SETB P1.0
        ACALL DELAY5US
        CLR P1.0
        ACALL DELAY60US
        MOV A,P1.1
        MOV P2.0,A
        ACALL DELAY60US
        MOV A,P1.1
        MOV P2.0,A
        ACALL DELAY60US
        MOV A,P1.1
        MOV P2.0,A
        ACALL DELAY60US
        MOV A,P1.1
        MOV P2.0,A
        ACALL DELAY60US
        MOV A,P1.1
        MOV P2.0,A
        ACALL DELAY60US
        MOV A,P1.1
        MOV P2.0,A
        ACALL DELAY60US
        MOV A,P1.1
        MOV P2.0,A
        ACALL DELAY60US
        MOV A,P1.1
        MOV P2.0,A
        ACALL DELAY60US
        MOV A,P1.1
        MOV P2.0,A
        ACALL DELAY60US
        MOV A,P1.1
        MOV P2.0,A
        ACALL DELAY60US
        CLR P1.0
        ACALL DELAY5US

        MOV A,P1.1
        INC R0
        MOV R1,A
        MOV A,R0
        CJNE A,#09H,AGAIN

        SETB P1.0
        ACALL DELAY5US
        CLR P1.0
        ACALL DELAY5US
        MOV A,P1.1
        MOV P2.0,A
        ACALL DELAY60US
        MOV A,P1.1
        MOV P2.0,A
        ACALL DELAY60US
        MOV A,P1.1
        MOV P2.0,A
        ACALL DELAY60US
        MOV A,P1.1
        MOV P2.0,A
        ACALL DELAY60US
        MOV A,P1.1
        MOV P2.0,A
        ACALL DELAY60US
        MOV A,P1.1
        MOV P2.0,A
        ACALL DELAY60US
        MOV A,P1.1
        MOV P2.0,A
        ACALL DELAY60US
        MOV A,P1.1
        MOV P2.0,A
        ACALL DELAY60US
        MOV A,P1.1
        MOV P2.0,A
        ACALL DELAY60US
        MOV A,P1.1
        MOV P2.0,A
        ACALL DELAY60US

        MOV A,R1
        MOV R2,A
        MOV A,#0
        MOV R3,#0
        MOV A,R2
        ANL A,#0FH
        MOV R4,A
        MOV A,R2
        SWAP A
        ANL A,#0FH
        MOV R2,A
        MOV A,R2
        ADD A,R4
        MOV R2,A
        MOV A,R2
        MOV R3,A
        MOV A,#0
        CLR C
        SUBB A,#32H
        MOV R4,A
        MOV A,R3
        ADD A,R4
        MOV R3,A

SEND:   MOV A,R3
        MOV SBUF,A
        ACALL DELAY100MS
        MOV A,R2
        MOV SBUF,A
        ACALL DELAY100MS
        SJMP AGAIN

DELAY5US:
    NOP
    NOP
    NOP
    NOP
    RET

DELAY60US:
    MOV R6,#1
WAIT:   DJNZ R6,WAIT
    RET

DELAY100MS: 
    MOV R5,#10
WAIT1:  MOV R7,#250
WAIT2:  DJNZ R7,WAIT2
    DJNZ R5,WAIT1
    RET

END

这里使用了AT89C51单片机进行编程，通过P1口向DS18B20发送指令并接收温度数据，最后使用串口通信将温度数据发送至上位机进行显示。请注意，代码中的延时函数（DELAY5US、DELAY60US和DELAY100MS）需要根据实际情况进行调整。