For starters, the 44 pin is probably a TQFP, rather than a DIP.  Look for
the /P on the end

The I/P at 4 MHz is a bit confusing, I thought the I only came in 20 MHz.
But the 04/P clearly is a 4 MHz part ... they are not all 20 MHz.  I is a
little better temperature spec than the plain part, but not as good as E.  I
stands for Industrial and E for automotive(!)  For hobbyist use it doesn't
matter, but it gets hot under the hood of a car.

The A part is a little cheaper than the plain, and it has some additional
feature, although I don't recall what ... another comparator maybe?  The A
part needs newer software to program it than the plain part, I don't know
whether that is an issue with the Picstart+, but it is with a lot of
programmers.

--McD

----- Original Message ----- 
From: <cyberia429-piclist@yahoo.com.au>
To: "Microcontroller discussion list - Public." <piclist@mit.edu>
Sent: Wednesday, May 11, 2005 1:50 PM
Subject: [PIC] 16F877 Confusion


> Picers - I need to buy a few 16F877's/F877A's but I'm somewhat confused by
the
> options. A company like, eg Futurlec offers the following :-
>
> http://www.futurlec.com/
>
> PIC16F877-04/P PIC16F877 Flash 40-pin 4MHz 8kB Micro
> PIC16F877-20/P PIC16F877 Flash 40-pin 20MHz 8kB Micro. With A/D
PIC16F877A-I/L
>
> PIC16F877A Flash 44-pin 4MHz 8kB Microcontroller (??)
> PIC16F877A-I/P PIC16F877A Flash 40-pin 4MHz 8kB Microcontroller
>
> For starters, 44 pin is no good 'coz I use a 40 pin Picstart+
>
> What's this 4Mhz vs 20MHz? There's no mention of different speed limits in
my
> PIC16F87X Microchip data sheet - they're all DC to 20MHz, aren't they?
>
> I'm only in the xptal stage - doing LCDs, starting out on I2C, ADC  &
stuff
> like that. Would anyone be willing to offer advice on what I should go
for?
> Especially any gotchas v/v the F877A?
>
> Thankz if can help - Debbie :)
>
> Find local movie times and trailers on Yahoo! Movies.
> http://au.movies.yahoo.com
> -- 
> http://www.piclist.com PIC/SX FAQ & list archive
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> http://mailman.mit.edu/mailman/listinfo/piclist
>


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