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How can I read out the PC?

Mario Lorber

Hi all!

I need to read out the actuall value of the program counter (PC). How can I do that?
I use the Keil uVision environment with an 8051 based controller!

Thanks for your help!

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  • 0 in reply to Jon Ward

    So far, I have a first solution on my own:

    mov r0, #high(return_label)
mov r1, #low(return_label)

ljmp sub_function

return_label:
; any code here

sub_function:
clr a
mov DPH, r0
mov DPL, r1
jmp @a+DPTR

    I can exchange the label in the first two lines with $. That saves a label name.
    The only thing that disturbes me is that I need the DPTR. Does anyone has an idea with that?

Reply
  • 0 in reply to Jon Ward

    So far, I have a first solution on my own:

    mov r0, #high(return_label)
mov r1, #low(return_label)

ljmp sub_function

return_label:
; any code here

sub_function:
clr a
mov DPH, r0
mov DPL, r1
jmp @a+DPTR

    I can exchange the label in the first two lines with $. That saves a label name.
    The only thing that disturbes me is that I need the DPTR. Does anyone has an idea with that?

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