main.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。

     ORG    0000H
     AJMP   START
    ORG    000BH
    AJMP   ERROR
START:  
     MOV    SP, #50H           
    ACALL  WATCHDOG
CAQULATER:
    ACALL  FEEDDOG
     ACALL  DISPLAY
     ACALL  KEYREAD
     MOV    A,22H
     ANL    A,#F0H
     JZ             NUMPROCESS_SLECT
     JB     22H.4,  ASMDPROCESS_SLECT 
     JB     22H.5,  CLEARALL_SLECT
     JB     22H.6,  RESULTOUT_SLECT
     JB     22H.7,  NOKEYDOWN_SLECT
NUMPROCESS_SLECT:
     ACALL  NUMPROCESS
     AJMP   CAQULATER
ASMDPROCESS_SLECT:           
     ACALL  ASMDPROCESS
     AJMP   CAQULATER
CLEARALL_SLECT:     
     ACALL  CLEARALL
     AJMP   CAQULATER
RESULTOUT_SLECT:
     ACALL  RESULTOUT
     AJMP   CAQULATER
NOKEYDOWN_SLECT:
     ACALL  NOKEYDOWN
     AJMP   CAQULATER
   END