Hmm,

I'd have to alter my programmer to use the extra memory.

Also DigiKey is a US company. I do not know of a good UK company. The
company I currently use don't have a big variety of products. Shame really.
The Pic16f628/04p is 5 pence cheaper than the 16f84 at my place. They also
do not sell a 20MHz version. That's a shame really as I could really do with
a 20MHz version.

I'll check out the data sheet about the config word. Thanks for the help
though. Much appreciated.

Regards,

David Stubbs

WEB: www.nti-uk.com
TEL UK: 07968 397782


> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Byron A Jeff
> Sent: 27 July 2001 6:55 PM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [PIC]: 16f84 v 16f84a
>
>
> On Fri, Jul 27, 2001 at 02:55:36PM +0100, David Stubbs wrote:
> > Hey,
> >
> > I asked about some 16f84's at a shop a bit ago and they told me
> they were no
> > longer in production but a 16f84a version is available. I
> haven't had time
> > to properly look through the 16f84a's data sheets yet but want
> to know the
> > main differences. The only difference I know is that a 20MHz version is
> > available, where I believe a 10MHz was the max for the non A one.
> >
> > One main issue though, Is it exactly the same to write the
> program to it? (I
> > use my own software to program it)
>
> Just a friendly piece of advise on the subject. Don't use the
> 16F84a parts.
> Microchip is clearly trying to put them into an end of life state.
>
> The alternative is the 16F628. Readily available at Digikey.
> Here's the scoop.
>
> - Twice the program memory
> - Three times the data memory
> - three timers vs. 1 for the 16F84a
> - two comparators vs. 0 for the 16F84a
> - twice the data eeprom memory
> - hardware USART
> - up to 3 extra I/O pins.
> - 4 Mhz internal osciallator.
> - Runs up to 20 Mhz.
> - Can be low voltate programmed.
>
> And you get this all at 2/3 the price of a 16f84a. That's right. The part
> costs a lot less. At digikey the 16f84a is $6.00. The 16F628 is
> $3.88 in the
> 20 Mhz version.
>
> The parts are both pin and programming compatible. Be sure to
> check for any
> differences in the config word though.
>
> Considering that you get a whole bunch more for a whole lot less,
> I can't see
> any reason to purchase 16F84a parts anymore. And considering the
> pricing, I'm
> pretty sure that's what Microchip expects.
>
> BAJ
>
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>

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