gnupic: Re: [gnupic] picp .hex file problem
Subject:
Re: [gnupic] picp .hex file problem
From:
Byron A Jeff ####@####.####
Date:
15 Aug 2005 13:51:48 +0100
Message-Id: <20050815125143.GB13347@cleon.cc.gatech.edu>
On Mon, Aug 15, 2005 at 09:13:57AM +0200, Gabor Kiss [Bitman] wrote:
> >The 16F88 must be programmed to a 4 word boundary. The purpose of the
> >multiword write is to speed up the time necessary to write the program
> >memory.
>
> Weeks ago I found a similar problem with 16F87[67]A.
> It seems that these chips must be programmed in two word chunks.
Actually it's 4/8 word chunks for the 16F87XA series.
> Meanwhile 16F87[67] has no such restriction.
Correct. It writes one word at a time.
> And I did not find any information about this "feature" in
> the programming specification.
It's right in the algorithm in Figures 2-2 and 2-3. There's
is a IF flowbox that asks "Eight loads done?". Also in the
datasheet in section 3.6 they discuss that to self program that
you must do 4 loads at a time.
Pretty much any PIC part that has more than 2K words of
program memory will have multi-word writes now.
BAJ
