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PICList Thread
'[PIC] 16F628 vs 16F84 vs 16C72 A+24C08'
2002\08\01@081529 by Rajiv Thakur

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The debate on 16F84 vs 16F628 has been interesting. I wish to add another
dimension ie of 16C72 A (28 pin) + external flash memory of 24C08.

16C72A+24C08 is cheaper than 16F628 and is cheaper than 16F84. It has a
program memory double than of 16F84 and also gives you 6 additional ports as
compared to 16F84 + AD converters+PWM . (8 additional ports C0-C7 less 2
ports to communicate with external flash memory).

All the programs on 16F84 run on 16C72A except that the subroutine to
write/read external 24C08 needs to be different.

Niel and Baj - Await your critique on this.

Regards,

Rajiv Thakur

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2002\08\01@082150 by Dominic Stratten

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Oooooooooh - so all those hundreds of PIC16C72A 's that I've just bought for
selling on ;-) weren't a waste of money after all :)

You've just made my day Rajiv


{Original Message removed}

2002\08\01@083254 by Rajiv Thakur

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If U need the subrotine to write the flash memory let me know

Rajiv
----- Original Message -----
From: "Dominic Stratten" <spam_OUTsalesTakeThisOuTspamPICBITS.COM>
To: <.....PICLISTKILLspamspam@spam@MITVMA.MIT.EDU>
Sent: Thursday, August 01, 2002 5:52 PM
Subject: Re: [PIC] 16F628 vs 16F84 vs 16C72 A+24C08


> Oooooooooh - so all those hundreds of PIC16C72A 's that I've just bought
for
{Quote hidden}

another
> > dimension ie of 16C72 A (28 pin) + external flash memory of 24C08.
> >
> > 16C72A+24C08 is cheaper than 16F628 and is cheaper than 16F84. It has a
> > program memory double than of 16F84 and also gives you 6 additional
ports
{Quote hidden}

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2002\08\01@084144 by Wouter van Ooijen

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> The debate on 16F84 vs 16F628 has been interesting. I wish to
> add another
> dimension ie of 16C72 A (28 pin) + external flash memory of 24C08.
> ...
> Niel and Baj - Await your critique on this.

And you have found the way to run code from an external eeprom chip?

Wouter van Ooijen

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2002\08\01@092757 by Rajiv Thakur

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----- Original Message -----
From: "Wouter van Ooijen" <EraseMEwfspam_OUTspamTakeThisOuTXS4ALL.NL>
To: <PICLISTspamspam_OUTMITVMA.MIT.EDU>
Sent: Thursday, August 01, 2002 6:11 PM
Subject: Re: [PIC] 16F628 vs 16F84 vs 16C72 A+24C08


> > The debate on 16F84 vs 16F628 has been interesting. I wish to
> > add another
> > dimension ie of 16C72 A (28 pin) + external flash memory of 24C08.
> > ...
> > Niel and Baj - Await your critique on this.
>
> And you have found the way to run code from an external eeprom chip?
>
> Wouter van Ooijen

The program code is in the program memory of the chip. Only the flash memory
is subsituted by an external memory

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2002\08\01@102128 by Wouter van Ooijen

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> The program code is in the program memory of the chip. Only
> the flash memory
> is subsituted by an external memory

So you suggest to use an OTP chip instead of a flash? Maybe nice for
production, but not very appropriate for development work....

Wouter van Ooijen

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2002\08\01@105738 by Byron A Jeff

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On Thu, Aug 01, 2002 at 05:47:40PM +0530, Rajiv Thakur wrote:
> The debate on 16F84 vs 16F628 has been interesting. I wish to add another
> dimension ie of 16C72 A (28 pin) + external flash memory of 24C08.
>
> 16C72A+24C08 is cheaper than 16F628 and is cheaper than 16F84. It has a
> program memory double than of 16F84 and also gives you 6 additional ports as
> compared to 16F84 + AD converters+PWM . (8 additional ports C0-C7 less 2
> ports to communicate with external flash memory).
>
> All the programs on 16F84 run on 16C72A except that the subroutine to
> write/read external 24C08 needs to be different.
>
> Niel and Baj - Await your critique on this.

It's not flash. So it's not reprogrammable. So it's useless for development.

That's pretty much the end of that discussion.

We're talking about parts for hobby or small scale distribution. As Neil has
pointed out, the overall cost isn't really that relevant.

Now if you bring a 16F872 to the table, then you may be onto something.

BAJ

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2002\08\01@211905 by Michael Rigby-Jones

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{Quote hidden}

Possibly usefull for a production device with stable code, but it has the
overwhelming disadvantage that it is not a flash device, so can be
programmed only once.

Regards

Mike

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