topic Re: how to get program counter (PC) in S12 / MagniV Microcontrollers

how to get program counter (PC)

mikoran — Thu, 14 Aug 2008 15:22:18 GMT

can u help me how to get the value of the program counter?

TFR PC, D
STD u16pc

but it didnt work.

tnx.

Re: how to get program counter (PC)

CrasyCat — Thu, 14 Aug 2008 16:18:12 GMT

Hello

PC is not a valid operator for the TFR instruction according to the HCS12 core reference manual.

Are you using CodeWarrior and programming in assembler?

Then I would write the following in your assembly source file:

LDX #*

CrasyCat

Re: how to get program counter (PC)

mikoran — Thu, 14 Aug 2008 16:34:50 GMT

yes i am using codewarrior but using C. i just add that inline assembly code..

Re: how to get program counter (PC)

CrasyCat — Fri, 15 Aug 2008 14:53:22 GMT

Hello

I am not sure you can do that in inline assembly.

May ask you why you need to load the PC in a register?

What are you trying to achieve here?

CrasyCat

Re: how to get program counter (PC)

CompilerGuru — Thu, 29 Oct 2020 09:29:38 GMT

I'm wondering just as CrazyCat why you want to retrieve the PC, do you really need it?

If you do need it, see below for one way how to do it.
This snippet gets the PC as it is at the STX instruction, just after the LEAX.

Daniel

Code:

unsigned int pcVar;void test(void) {  __asm {    LEAX 0,PC;    STX pcVar;  }}

Re: how to get program counter (PC)

mikoran — Tue, 19 Aug 2008 09:20:48 GMT

ok tnx a lot.

I need to retrieve PC for later debugging purposes. I have this module that would record the details during RAM fault