Bryan Mumford wrote:
> I've found a square root function in the archives, but I don't
> understand the code as written, and neither does my assembler! Here's
> a sample:
>
>        clrf ACCcHI,f ;
>        clrf ACCbLO,w ;
>
> I understand the "clrf" followed by a register, but what's the ",f"
> and ",w" mean? I thought CLRF had no additional parameters (beyond
> the register).

On the 16-series this is illegal syntax (or at least undocumented syntax).
I've no idea what MPASM does about it. Ignors it or gives an error maybe.

On the 18-series this is just OK, *IF* the values of the symbols
"f" and "w" are as normal, w=0 and f=1. *BUT*, the second parameter
doesn't stand for "WREG" or "FILE", they are "Access bank" or "Bank
as defined by the BSR". So there will be *no* clearing of WREG in either
case, as I understand it, and opposed to what was said in another post.

And, of course, MPASM doesn't care if you se a/b or f/w or whatever
as the second parameter, as long as the symbols has the right value.

Jan-Erik.

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