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Problem with assembly

neo neo

Dear All,
I have written a c program like:


char Read(unsigned char ucdevice,unsigned char ucaddress)
{
  int iNo_data = 0;
// some code here

}

The assembly generated for the line 'int iNo_data = 0;' is,

C:0x8285    E4       CLR      A
C:0x8286    900137   MOV      DPTR,#0x0137
C:0x8289    F0       MOVX     @DPTR,A
C:0x828A    A3       INC      DPTR
C:0x828B    F0       MOVX     @DPTR,A

The logics are clear here. But when I do a step by step execution with breakpoints, after executing the address c:0x8286, the assembly generated changes as ,

C:0x8285    E4       CLR      A
C:0x8286    900137   MOV      DPTR,#0x0137
C:0x8287    0137     AJMP     C:8037
C:0x8289    F0       MOVX     @DPTR,A
C:0x828A    A3       INC      DPTR
C:0x828B    F0       MOVX     @DPTR,A

Is the FLASH is getting changed? If so how could a MOV instruction writes to the FLASH location?

I cant understand what is happening here.

Can anybody clarify this?

Thanks in advance,
-Neo

Parents
  • 0 in reply to Christoph Franck

    ...What changes is how the IDE interprets the contents. I would guess that the single-stepping messes up the interpretation algorithm somehow...

    How could it happen so? Is there any way to avoid this?what I have to do?

    ...Whatprocessor you are using...
    I am using c8051f120.
    ...How you are debugging...
    using EC2,connect to my target, download the code, place a breakpoint,run upto the breakpoint,goto the dissassembly window, perform step by step execution by pressing F11.

Reply
  • 0 in reply to Christoph Franck

    ...What changes is how the IDE interprets the contents. I would guess that the single-stepping messes up the interpretation algorithm somehow...

    How could it happen so? Is there any way to avoid this?what I have to do?

    ...Whatprocessor you are using...
    I am using c8051f120.
    ...How you are debugging...
    using EC2,connect to my target, download the code, place a breakpoint,run upto the breakpoint,goto the dissassembly window, perform step by step execution by pressing F11.

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