If you only need 8 different actions based on 8 different bytes you send to
PIC you can do something sneaky...

Use the BTFSC or BTFSS instructions.  You have 8 bits in input and can test
each one seperately and do a skip or jump.

I must however say that smallest and simplest solution for a decision like
this is to asume you get a value in correct range and simply do like this:

<- set bank bits to jumptable here before doing any computed jumps...
movlw    'A'-1                Get value of smallest possible input - 1
subwf    valToTest, W    subtract value from input
addwf    PCL, F            add remainder to PCL to do a relative jump
goto    Acode
goto    Bcode
goto    Dcode
and so on...

Always same speed in decision regardless of input.
Quick and dirty :-)

    KreAture



----- Original Message -----
From: "Jinx" <joecolquitt@CLEAR.NET.NZ>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Thursday, January 23, 2003 3:11 AM
Subject: Re: [PIC:] NEWBIE - Check To See What Letter Is Being Received from
U ART


> > No need to reload each time.
> >
> > This works because:  (X xor A) xor (A xor B)
> > is the same as: X xor (A xor A) xor B
> > which is the same as X xor 0 xor B
> > which is the same as X xor B.
>
> That's quite true. I suggested XORs in the original answer and
> put up SUBLW only as an alternative to SUBWF. Reloading
> W unnecessarily is inefficient so I commented it
>
> --
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> [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads
>

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