DS1620温度芯片与8751芯片连接代码

               lcd_rw     equ 0b4h
               lcd_e      equ 0b5h
               th_lsb     data 30h
               th_msb     data 31h
               tl_lsb     data 32h
               tl_msb     data 33h
               b          equ  0f0h
               p2         equ  0a0h
               p3         equ  0b0h
               acc        equ  0e0h
               dph        equ  83h
               dpl        equ  82h

org  0         ; Establish Reset Vector Here

Hello:
               lcall resetlcd
               lcall initlcd
             

bsp; mov   a,#1
               mov   b,#0
               lcall placecur
               lcall prtlcd
               db   ' --**  DS1620  **-- ',0
               mov   r4,#offcur
               lcall wrlcdcom
               mov   a,#2
               mov   b,#0
               lcall placecur
               lcall prtlcd
               db   '     PROGRAMMER     ',0
               mov   r4,#offcur
               lcall wrlcdcom
               mov   a,#3
               mov   b,#0
               lcall placecur
               lcall prtlcd
               db   '                    ',0
               mov   a,#4
               mov   b,#0
               lcall placecur
               lcall prtlcd
               db   '   { VERSION 1.0 }  ',0
               lcall big_delay2
               lcall big_delay2

comin_back:
               lcall resetlcd
               lcall initlcd
               sjmp  select
back:
               mov   a,#2
               mov   b,#0
               lcall placecur
               lcall prtlcd
               db   '*-{ PROGRAM MODE }-*',0
               mov   a,#3
               mov   b,#0
               lcall placecur
               lcall prtlcd
               db   ' PRESS FUNCTION KEY ',0
               mov   r4,#offcur
               lcall wrlcdcom

select:
               mov   p2,#0ffh   ; setup port2 for input/ for 8031
                                ; use port0
                                ; isr routine for CPU operation
buttons:
               jnb   p2.4,isr   ; Display 1620 programmed high
                                ; & low setpoints.
               jnb   p2.5,begin1; MODE SWITCH program/display temp.
               jnb   p2.2,set1  ; Begin programming sequence for

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