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'[pic] Moving up from 16F648A'
2005\11\23@020600 by M Graff

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I need more I/O for my next project than the 16F648 has.  I need about
14 output and 3 input, two of which are interrupts.  Ideally, a few more
inputs are useful too, but not required.

Any suggestions?

--Michael

2005\11\23@031350 by Mike Young

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The 16F690 has 18 GPIO, 12 ADC, ECCP, USART, I2C, SIP.

----- Original Message -----
From: "M Graff" <spam_OUTexplorer-piclistTakeThisOuTspamflame.org>
To: <.....PiclistKILLspamspam@spam@mit.edu>
Sent: Wednesday, November 23, 2005 1:05 AM
Subject: [pic] Moving up from 16F648A


>I need more I/O for my next project than the 16F648 has.  I need about
> 14 output and 3 input, two of which are interrupts.  Ideally, a few more
> inputs are useful too, but not required.
>
> Any suggestions?
>
> --Michael
> --

2005\11\23@034134 by Wouter van Ooijen

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> I need more I/O for my next project than the 16F648 has.  I
> need about
> 14 output and 3 input, two of which are interrupts.  Ideally,
> a few more
> inputs are useful too, but not required.
>
> Any suggestions?

74HC595? 16F876A? 18F252?

uChip has some nice SPI and I2C expanders too.

Wouter van Ooijen

-- -------------------------------------------
Van Ooijen Technische Informatica: http://www.voti.nl
consultancy, development, PICmicro products
docent Hogeschool van Utrecht: http://www.voti.nl/hvu


2005\11\23@035837 by Wouter van Ooijen

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> I need more I/O for my next project than the 16F648 has.  I
> need about
> 14 output and 3 input, two of which are interrupts.  Ideally,
> a few more
> inputs are useful too, but not required.
>
> Any suggestions?

74HC595? 16F876A? 18F252?

uChip has some nice SPI and I2C expanders too.

Wouter van Ooijen

-- -------------------------------------------
Van Ooijen Technische Informatica: http://www.voti.nl
consultancy, development, PICmicro products
docent Hogeschool van Utrecht: http://www.voti.nl/hvu


2005\11\23@042221 by Vasile Surducan

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On 11/23/05, M Graff <explorer-piclistspamKILLspamflame.org> wrote:
> I need more I/O for my next project than the 16F648 has.  I need about
> 14 output and 3 input, two of which are interrupts.  Ideally, a few more
> inputs are useful too, but not required.
>
> Any suggestions?

Usually, all tricks for sharing pin functions will help.
Example: 4 buttons may be connected between the ENABLE pin and the
other 4 data pins of a LCD module if four diodes are mounted in series
with the buttons.
Disabling the LCD will allow button read, enabling the LCD will
deactivate buttons.

There are many other tricks, the only way to do those tricks is to
analyze carefully your application before claiming a jump to a bigger
PIC.

cheers,
Vasile
http://surducan.netfirms.com

2005\11\23@052612 by Jinx

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> I need more I/O for my next project than the 16F648 has.  I
> need about 14 output and 3 input, two of which are interrupts.
>  Ideally, a few more inputs are useful too, but not required

Like Vasile was saying, what I/O functions do you need ? There
are ways to get around I/O shortages by multiplexing with s/w or
h/w

Moving to a bigger PIC is the obvious easy way, but making a
smaller PIC accomplish the same thing is more rewarding

2005\11\23@080948 by olin piclist

face picon face
M Graff wrote:
> I need more I/O for my next project than the 16F648 has.  I need about
> 14 output and 3 input, two of which are interrupts.  Ideally, a few more
> inputs are useful too, but not required.
>
> Any suggestions?

Since you say only the number of pins matter, then 16F876A, 18F2520, or
13F3013.  A better answer will require a better question.


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