• State Not Answered
  • Locked Locked
  • Replies 12 replies
  • Subscribers 21 subscribers
  • Views 1391 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
Related
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 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!

Parents
  • 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?

Children
No data