> So, in essence, the instruction says:
> "Skip the next instruction if the the number in W is NOT zero"

This is not exactly true. It is more accurate to say:

"Skip the next instruction if the result of the last operation that affected
the status bit is not zero (Z==0)"

Douglas Wood
Software Engineer
dbwood@kc.rr.com

Home of the EPICIS Development System for the PIC and SX
http://www.piclist.com/techref/member/DW--RA4

----- Original Message -----
From: "M. Adam Davis" <adavis@UBASICS.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Thursday, February 08, 2001 12:46 PM
Subject: Re: [PIC]:programming question


> BTFSC stands for "Bit Test F, Skip if Clear"
>
> Which means, test a bit in the following register.  If the bit is clear
> (zero), then skip the next instruction.
>
> The STATUS register holds several bits which are of great use to the
> programmer, one of which is the Z or Zero bit.  This bit it set if the W
> register was changed by another instruction to equal 0.  It stays set
> until the W register is changed again to something other than 0.  There
> are a few instructions (such as SWAPF) which do not test the W register,
> otherwise just about any change to W will set or clear the Z bit depending
> on whether W=0.
>
> So, in essence, the instruction says:
> "Skip the next instruction if the the number in W is NOT zero"
>
> -Adam
>
> Lucas Fenoll Molina wrote:
> >
> > hi I would like to know what does this line of code thanks
> >
> > btfsc STATUS,Z
> >
> > --
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>
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>

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