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'[PIC:] upward from 16F628?'
2004\03\08@001627 by Darren Gibbs

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Greetings,

I've hit the code size (and in a few cases speed) wall with the 16F628.
Can anyone suggest a PIC which is pin compatible but has >4K of code
space (and ideally, but not necessarily, can be run at >20MHz)?

thanks,

darren

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2004\03\08@003944 by Shawn Tan Ser Ngiap

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On Monday 08 March 2004 13:14, you wrote:
> Greetings,
>
> I've hit the code size (and in a few cases speed) wall with the 16F628.
> Can anyone suggest a PIC which is pin compatible but has >4K of code
> space (and ideally, but not necessarily, can be run at >20MHz)?
>

I don't think that you're going to find a 'pin-compatible' one with those specs.. >20MHz would imply 18F parts and IIRC, they're not pin-compatible with the '628.. You'd best use a 18F PIC, which might help you reduce your code size as it has a larger instruction set.. and it runs at 40MHz.. the 18F1320 has 4K word, and has 18pins (although not compatible with '628)..

with metta,
Shawn Tan.
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2004\03\08@013457 by Bob Axtell

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The just-released PIC16F648 will handle the code space, and more ram,
too. Theoretically, 20M is the fastest you can run. But most of the chip
will run MUCH faster, as long as it is kept at room temp..,. also the
internal oscillator will fade away after about 25M.

Do some testing.

--Bob

Darren Gibbs wrote:
{Quote hidden}

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2004\03\08@015400 by Wouter van Ooijen

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> I've hit the code size (and in a few cases speed) wall with
> the 16F628.
> Can anyone suggest a PIC which is pin compatible but has >4K of code
> space (and ideally, but not necessarily, can be run at >20MHz)?

- 16F648A has 4k, almost compatible
- all 16F's max out at 20 MHz
- 18F's can run at 40 MHz, but not compatible (16-bit instructions)
- Ubicom SX can run at 75 MHz (compares to 300 MHz PIC!), but not
compatible (12-bit instructions)

Wouter van Ooijen

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2004\03\08@022347 by Ken Pergola

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Wouter van Ooijen wrote:

> - all 16F's max out at 20 MHz


Just for everyone's PIC trivia information:
-------------------------------------------

I was very surprised myself that this is not true anymore.
Believe it or not, some of the newer versions of the older PIC16C5X baseline
parts are touted by Microchip to run at 40 MHz.

This is in the PIC16C5X EPROM/ROM-Based 8-bit CMOS Microcontroller Series
Data Sheet (DS30453D):

Operation between 20 to 40 MHz requires the following:
 VDD between 4.5V. and 5.5V
 OSC1 externally driven
 OSC2 not connected
 HS mode
 Commercial temperatures

Devices qualified for 40 MHz operation have -40 designation (ex:
PIC16C54C-40/P).



Interesting, I never thought I'd see this day with the older baseline parts.

Best regards,

Ken Pergola

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2004\03\08@024458 by Vasile Surducan

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On Mon, 8 Mar 2004, Wouter van Ooijen wrote:

> > I've hit the code size (and in a few cases speed) wall with
> > the 16F628.
> > Can anyone suggest a PIC which is pin compatible but has >4K of code
> > space (and ideally, but not necessarily, can be run at >20MHz)?
>
> - 16F648A has 4k, almost compatible
> - all 16F's max out at 20 MHz

   all 16F628/20MHz supplied at 5V are running at 25MHz, much better with
external oscillator but also in (tested) HS mode.

> - 18F's can run at 40 MHz, but not compatible (16-bit instructions)
> - Ubicom SX can run at 75 MHz (compares to 300 MHz PIC!), but not
> compatible (12-bit instructions)
>
   SX52BD 100MHz ?

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2004\03\08@034630 by hael Rigby-Jones

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{Quote hidden}

I don't think the 100MHz parts are available.  I vaguely remember that they
had some issues and never made it to full production.

Regards

Mike




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2004\03\08@055030 by Bob Axtell

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Vasile Surducan wrote:
>
>     all 16F628/20MHz supplied at 5V are running at 25MHz, much better with
> external oscillator but also in (tested) HS mode.

I've had success here, too.

I'm doing a timing generator design at 25Mhz using the 5V PIC12F629
SOIC8.  It even works in the DIP package- but in my experience, SO
always beats a DIP. I'm using Epson's cylindrical (CA301) crystals with
22pf caps. To be safe, I'm making a jig to test the PICs before
installing them...

Also, careful PCB layout is pretty important to success at very high
speeds. I make the CA301 laydown with its leads being bathed in the
solder of the 0805 22pf caps. Keeps the capacitance very low. NOTE:
SMD crystals add a lot of capacitance to the loop; don't use 'em.

--Bob
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