免费文档范文--大棚温室自动控制系统文档设计(八)

             LCALL rd_rand
             MOV a,r6
          ANL a,#00111111b
          RL a
          RL a
             MOV b,a
          MOV a,r7
          RL a
          RL a
             MOV r7,a
          MOV a,b
          ORL a,r7
             MOV r6,a 
             MOV a,b
          ANL a,#00000011b
         MOV r7,a
 ;r7放置AD7416温度值高2位,r6放置低8位
             CLR C
 RET
 wr_byte:NOP;AT24Cxx Byte Write function.
;Called with programmable address in A, byte address in
; register pair ADDR_HI:ADDR_LO, data in register XDATA.
; Does not wait for write cycle to complete.
; Returns CY set to indicate that the bus is not available
; or that the addressed device failed to acknowledge.
; Destroys A.
    LCALL    start
   JC x49 
   RL a  
     ORL a, FADDR 
   CLR acc.0  
     LCALL    shout         
   JC x48  
        MOV a, addr_hi     
      LCALL shout          
     JC x48            
   MOV a, address 
     LCALL    shout          
   JC x48  
   MOV a, zdata 
     LCALL    shout          
   JC x48
   CLR c  
 x48: LCALL    stout
 x49: ret
 rd_curr:NOP; AT24Cxx Current Address Read function.
 ; Called with programmable address in A. Returns data in A.
 ; Returns CY set to indicate that the bus is not available
 ; or that the addressed device failed to acknowledge.
 LCALL    start
 JC x45  
 RL a  
 ORL&n

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