There is an inderirection register that you can use to set the port, upon
which you can perform port accesses.  As far as specifying the bit to
access, there are methods contained in the faq.  There isn't an easy way
to do it, but it is possible.

First read the information in the data sheet about the indirection
register (register 0 on most parts, INDC if I remember correctly)

-Adam

"What?  I couldn't very well say 'INDC, IIRC'..."

Gonzalo Jimenez Yamasaki wrote:
>
>     Hi all:
>
>     What I want to do exactly is to have to variables, one with the port I
> want to use (let4s call it "port") and another one with the bit I want to
> read (let4s call it "bit") then use the instruccion btfss.
>
>     Something like this:
>
>     porta --> port
>     3 -->    bit
>
>     btfss    port, bit
>
>     What should mean btfss porta, 3
>
>     Is it possible?
>
>     As far as I know, when you use btfss what is read is the address of
> port, not what this address contains.
>
>     I guess I can use somenthin like this:
>
>     port    equ    h'0005'        ;port = porta
>
>     and when I want portb, I should use (port + 1) the same for "bit", but,
> is there any other way?
>
>     Any help will be apreciate,
>
>     Thanks in advance,
>
>     Gonzalo
>
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