James Nick Sears wrote:
> 
> On page 16 (PDF page 18) of the PIC10F200 datasheet (
> http://ww1.microchip.com/downloads/en/devicedoc/41239A.pdf ) it says
> 
> "The General Purpose Register file is accessed, either directly or
> indirectly, through the File Select Register (FSR).  See Section 4.9
> "Indirect Data Addressing: INDF and FSR Registers"
> 
> Does this mean that an instruction like
> 
> movwf 0x18
> 
> will not work, and that everything has to go through FSR and INDF, or
> just that indirect addressing is available?

What they're getting at is that (unlike midrange parts), on baseline PICs,
like the 10Fs, FSR plays a role in both direct and indirect addressing.
Why?  It's because the bank selection bits are the top three bits of FSR.
That can be a real pain - it's an annoying limitation of that architecture,
although only really restrictive if you're trying to mix direct and indirect
register accesses, when more than 1 bank is involved.  If you're not doing
any indirect access, don't worry about it - just use "banksel" as usual, and
all will be fine.

David Meiklejohn
www.gooligum.com.au



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