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Understanding .LST file

 
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gjs_rsdi



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Understanding .LST file
PostPosted: Mon Mar 16, 2020 9:25 pm     Reply with quote

Hi

I am trying to understand the .LST file
I learn already (on the forum) to make the file with Symbolic format for easy understanding.
In the .LST is written for example:
Code:
0051:  MOVWF  @78
0055:  IORWF  @78,W


Can somebody tell me what the @ means?

Best wishes
Joe
PCM programmer



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PostPosted: Mon Mar 16, 2020 11:20 pm     Reply with quote

It means RAM address 0x78.
gjs_rsdi



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PostPosted: Tue Mar 17, 2020 12:00 am     Reply with quote

Thank you very much PCM programmer Smile
Helpful like always

Best wishes
Joe
Ttelmah



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PostPosted: Wed Mar 18, 2020 4:02 am     Reply with quote

Worth just giving a little extra data here. In punctuation, the '@' symbol is
normally referred to as 'at'. So the instructions access the memory 'at'
the specified location. Simple, and once you use this name, quite obvious.
Smile
temtronic



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PostPosted: Wed Mar 18, 2020 4:32 am     Reply with quote

this....
MOVWF @78

..can be read as...

'MOV'e the contents of the 'W'orking register to the 'F'ile 'AT' RAM location # 0x'78'.

PIC ASM is rather easy, only 35+ instructions to know. Unlike say Z80 or 6811, with 100+.

Motorola had a one bit micro, with only 16 instructions...
gjs_rsdi



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PostPosted: Wed Mar 18, 2020 4:18 pm     Reply with quote

Thank you Ttelmah and Temtronic Smile

And this:
Code:
0009:  MOVF   @78,W

Means move the file to ram location 78 and to the working register?

I worked a little bit with the 68HC811E2 in ASM long long time ago. I don't remember how many instruction it had but a lot.
I was happy when I found the PIC16C71 Smile

Best wishes
Joe
Ttelmah



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PostPosted: Thu Mar 19, 2020 1:05 am     Reply with quote

Exactly understanding that the '@' is being used as shorthand for 'RAM at',
makes it much easier to understand.
gjs_rsdi



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PostPosted: Fri Mar 20, 2020 5:46 am     Reply with quote

After reading again the answers, I am assuming correct that the below code is moving the content of ram location 78 to W?
Code:
MOVF   @78,W


Best wishes
Joe
temtronic



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PostPosted: Fri Mar 20, 2020 6:32 am     Reply with quote

From the instruction set chapter of the 46k22, but applicable to all PICs...

The contents of register ‘f’ are moved to
a destination dependent upon the
status of ‘d’. If ‘d’ is ‘0’, the result is
placed in W. If ‘d’ is ‘1’, the result is
placed back in register ‘f’ (default).
Location ‘f’ can be anywhere in the
256-byte bank.

MOVF @78,W

So in this case 'f' is RAM location 0x78
'W' is the Working register....
gjs_rsdi



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PostPosted: Sat Mar 21, 2020 2:02 am     Reply with quote

Thank you Temtronic Smile

Best wishes
Joe
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