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'[PIC]: Running out of I/Os! Need external register'
2001\01\01@062912 by Neil Gandler

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I am using a PIC16F77 in a design. Unfortunately I am running out of I/O and Microchip doesn't make a 60+ pin version of this PIC series. My only option for increased I/O in the PIC family is the more advanced processors that do not have
Flash based program memory and are more expensive. I am searching for an external register IC with readback of output state and similar current output capabality (~30mA). Thanks

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2001\01\01@143356 by Dan Michaels

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Neil Gandler wrote:
>I am using a PIC16F77 in a design. Unfortunately I am running out of I/O
and Microchip doesn't make a 60+ pin version
>of this PIC series. My only option for increased I/O in the PIC family is
the more advanced processors that do not have
>Flash based program memory and are more expensive. I am searching for an
external register IC with readback of output state and similar current
output capabality (~30mA). Thanks


You might consider boot-strapping another PIC as auxiliary slave,
and talking to it via I2C/etc. 28-pin PIC will get you about
21 extra I/O pins.

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2001\01\02@030459 by James Burkart

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What is involved in "boot-strapping" a pic... I've heard this term used in
audio amp IC's and even Op-Amps, but how does it apply to PIC's?

{Original Message removed}

2001\01\02@103316 by Lawrence Lile

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There are several good ways to get more IO

1. Adding a cheap brain dead PIC12C5x,  PIC54 or 505 and talking with it
through some serial protocol - rs232 or I2C

2.  Adding a simple shift register such as a 74LS595.  I'm using this trick
to drive an LCD.

3.  Ingenious combining of inputs and outputs.  This will usually cause
trouble in the long run.

-- Lawrence Lile


----- Original Message -----
From: "James Burkart" <grafxjkbspamKILLspamPACBELL.NET>
To: <.....PICLISTKILLspamspam.....MITVMA.MIT.EDU>
Sent: Tuesday, January 02, 2001 2:02 AM
Subject: Re: [PIC]: Running out of I/Os! Need external register
recommendation with similar current output capability


> What is involved in "boot-strapping" a pic... I've heard this term used in
> audio amp IC's and even Op-Amps, but how does it apply to PIC's?
>
> {Original Message removed}

2001\01\02@105621 by Dan Michaels

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James Burkart wrote:
>What is involved in "boot-strapping" a pic... I've heard this term used in
>audio amp IC's and even Op-Amps, but how does it apply to PIC's?
>

Most people already have routines to talk to their PICs
via RS-232, or have their PICs talk to I2C serial EEPROMs.
So simply setup a little network with a 2nd PIC as slave
to the first, where they talk to each other. RS-232
[using 0-5v] would probably be easier, as one could test
out the code of the slave unit directly from a PC.

- danM

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