Post by thread:[PIC]: 16f84 v 16f84a

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) Thanks again. Regards, David Stubbs WEB: http://www.nti-uk.com TEL UK: 07968 397782 {Original Message removed}

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 -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics

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: http://www.nti-uk.com TEL UK: 07968 397782 > {Original Message removed}

Maybe I can help you from the other side of the world. Somebody mentioned a few posts ago to try Avnet in the UK. I use Avnet here in SA and get just about the whole range from them. Quentin David Stubbs wrote: {Quote hidden}> > 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 -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics