resultout.txt

在Keil里面编写的可以运行于80C51单片机上的计算器程序。可以实现简单的加减乘除运算。

RESULTOUT:

MOV  3CH,#32H
MOV  3DH,#54H

      MOV  A, 37H 
      SWAP A
      ORL  A, 36H
      MOV  3AH,A
     JB     20H.0,  BCDADD_SLECT 
     JB     20H.1,  BCDSUB_SLECT
     JB     20H.2,  BCDMUL_SLECT
     JB     20H.3,  BCDDIV_SLECT
BCDADD_SLECT:
     ;ACALL  BCDADD
     AJMP   RESULT
BCDSUB_SLECT:           
     ;ACALL  BCDSUB
     AJMP   RESULT
BCDMUL_SLECT:     
     ;ACALL  BCDMUL
     AJMP   RESULT
BCDDIV_SLECT:
     ;ACALL  BCDDIV
     AJMP   RESULT
RESULT:
     MOV   A,  3CH
     ANL   A,  #0FH
     MOV   48H,A
     MOV   A,  3CH
     SWAP  A
     ANL   A,  #0FH
     MOV   49H,A
     MOV   A,  3DH
     ANL   A,  #0FH
     MOV   4AH,A 
     MOV   A,  3DH
     SWAP  A
     ANL   A,  #0FH
     MOV   4BH,A 
     MOV   R5,  #20H
     MOV   R0,  #20H
CLEARRAM2:
     MOV  @R0, #00H
     INC  R0
     DJNZ R5,  CLEARRAM2
  RET