51单片机汇编程序集(3)

                 MOV     R0,A
                 MOV     A,R5
                 MOV     R1,A
                CLR    C
      NDVMN9   : MOV     A,@R0
                ADDC   A,@R1
                 MOV     @R0,A
                INC    R0
                INC    R1
                DJNZ   R7,NDVMN9
      NDVMNA   :DJNZ   B,NDVMN5
                 MOV     A,M
                CLR    C
                SUBB   A,N
                ADD    A,R3
                 MOV     R1,A
                 MOV     A,R2
                 MOV     @R1,A
                 MOV     A,R3
                 MOV     R0,A
                RET
      ;N字节数据左移程序 RLC([R0])=(CF[R0])
      ;入口    :R0,R7
      ;占用资源:ACC,B
      ;堆栈需求:2字节
      ;出口    :R0,CF
      NRLCN    : MOV     B,R0
                CLR    C
      NRLN1    : MOV     A,@R0
                RLC    A
                 MOV     @R0,A
                INC    R0
                DJNZ   R7,NRLN1
                 MOV     R0,B
                RET

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本文关键字：单片机  51单片机，单片机-工控设备 - 51单片机