• State Not Answered
  • Locked Locked
  • Replies 8 replies
  • Subscribers 21 subscribers
  • Views 1306 views
  • Users 0 members are here
2025 survey

We are running a survey to help us improve the experience for all of our members. If you see the survey appear, please take the time to tell us about your experience if you can.

Options
How was your experience today?
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

How to change the DATA memory usage ?

Jimmy liao

Dear all,
I have one question about DATA memory usage.

Original situation:(quoted from .m51 file)

...
fno = 0x00;iflag=arg2;  // C-code and below is machine code
C:0x0E38    78A1     MOV      R0,#fno(0xA1)
C:0x0E3A    F6       MOV      @R0,A
C:0x0E3B    78AF     MOV      R0,#arg2(0xAF)
C:0x0E3D    E6       MOV      A,@R0
C:0x0E3E    F534     MOV      iflag(0x34),A

From above we can see: value in arg2(idata) is copied to DATA memory offset 0x34...

BUT after code merge I got the followings:(quoted from .m51 file)

...
fno = 0x00;iflag=arg2;  // C-code and below is machine code
C:0x0E38    78A1     MOV      R0,#fno(0xA1)
C:0x0E3A    F6       MOV      @R0,A
C:0x0E3B    78AF     MOV      R0,#arg2(0xAF)
C:0x0E3D    E6       MOV      A,@R0
C:0x0E3E    F53E     MOV      0x3E,A

The difference is: value in arg2(idata) is copied to DATA memory 0x3F !
(unfortunately I was asked to not to change this after code-merge...)

Can anyone give comments/breakthrough-point about this ? How can I got the same result as original case after code merge ?

0