用单片机实现温度远程显示 第10页

clr ri

     jb ri_f,rec_0     

     mov a,sbuf

     cjne a,#'@',rec_out    ;无效命令过滤处理

     setb ri_f              ;置接收中标志

     mov rec_buf_z,#rec_buf ;接收缓冲区首地址给接收指针

     mov rec_err,#73        ;设置最大接收字节数

     ajmp rec_1

rec_0:   mov a,sbuf

     cjne a,#0dh,rec_1

     clr ri_f

rec_1:   mov r0,rec_buf_z

     mov @r0,a

     inc rec_buf_z

     djnz rec_err,rec_out   ;接收溢出清接收标志

     clr ri_f

rec_out:pop acc

     pop ar0

     POP PSW

     reti

    end

６、巡回/定点转换检测子模块（rand_key.a51）

;-----------6----rand_key.a51

name key

EXTRN CODE(START)

extrn bit(key_work,key_f)

EXTRN DATA(DISP_buf,disp_wc,time_20ms,wdt)

PUBLIC KEY

prog SEGMENT CODE      ;定义代码段

     RSEG PROG

;-------------------------------------

KEY: mov a,#2

     add a,time_20ms

     cjne a,time_20ms,$

key_1:   mov wdt,#0

     orl 96h,#0e1h

     jnb key_f,key_1

     mov a,#2

     add a,time_20ms

     cjne a,time_20ms,$

     jnb key_f,key_1

     clr ea

     clr ex1

     cpl key_work

;--------------------------------------

key_out:mov dptr,#start

     push dpl

     push dph

     reti

     end

6、            rand_js.hex

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:10003600760008D582FA75220775F00AC395F07521

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:1004A3004202D0E022E6C3943A50022407240322F6

:00000001f