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'[PIC]:F877 to 18F? (more I/O)'
2004\06\22@083701 by al smith

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I've outgrown the I/O on the F877 (yes I know i can expand it using I2C) so
I am looking at the next size up.  Looks as if the 18F6525 might be a good
choice...comments?

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2004\06\22@090303 by Alan B. Pearce

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>I've outgrown the I/O on the F877 (yes I know i can expand it using I2C) so
>I am looking at the next size up.  Looks as if the 18F6525 might be a good
>choice...comments?

What sort of I/O do you need. Could you do it using shift registers? What
sort of devices do you have attached (I am thinking that if you have an LCD
then using Mike Predkos 2 line interface may save some pins)?

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2004\06\22@093803 by hael Rigby-Jones

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>-----Original Message-----
>From: al smith [spam_OUTmicro_eng2TakeThisOuTspamHOTMAIL.COM]
>Sent: 22 June 2004 13:36
>To: .....PICLISTKILLspamspam@spam@MITVMA.MIT.EDU
>Subject: [PIC]:F877 to 18F? (more I/O)
>
>
>I've outgrown the I/O on the F877 (yes I know i can expand it
>using I2C) so I am looking at the next size up.  Looks as if
>the 18F6525 might be a good choice...comments?

I would not hesitate to move onto the 18F series whilst you have the chance.
They are better in virtualy every respect (apart from perhaps price).  The
18F6525 is a newer device that (hopefully) doesn't suffer from the problems
of the first generation parts and gives a good increase in I/O and
peripherals.

There are a couple of things to watch for. One that I found annoying is the
much lower input impedance of the A/D peripheral, a maximum source impedance
of just 2.5K is recommended, compared to 10K for the 16F parts.  Some of the
SFR names have changed slightly as well, usualy because there is more than
one of the peripheral that it refers to.

Regards

Mike




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2004\06\22@103536 by al smith

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I need direct control I/O rather than using an I2C or shift register
(already using a 16bit I2C for some other things) for controlling various
FETs and feedbacks.  The additional I/O is also being required for future
expansion as well.

So the F6525 seems like a good choice?


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2004\06\22@104817 by Spehro Pefhany

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At 07:33 AM 6/22/2004 -0700, you wrote:
>I need direct control I/O rather than using an I2C or shift register
>(already using a 16bit I2C for some other things) for controlling various
>FETs and feedbacks.  The additional I/O is also being required for future
>expansion as well.
>
>So the F6525 seems like a good choice?

I've used the F8520 in a couple of instrument designs recently... really
nice having those 80 pins, and the cost is pretty reasonable if the 16Kx16
code memory is enough for you.

Best regards,

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