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'[PIC]: 16F84 vs. 16F628'
2001\03\18@031509 by NCS

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Just looking into the specs/prices on the 16F627/8 devices.

It seems they are pin-compatible with the 16F84, but have way
more features, and are less expensive.

Am I missing something?  Is it a drop-in replacement or are
there any caveats?

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2001\03\18@104433 by Dale Botkin

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On Sun, 18 Mar 2001, NCS wrote:

> Just looking into the specs/prices on the 16F627/8 devices.
>
> It seems they are pin-compatible with the 16F84, but have way
> more features, and are less expensive.
>
> Am I missing something?  Is it a drop-in replacement or are
> there any caveats?

I don't know, they look awfully good to me.  Faster, cheaper, more memory,
more features.  The only thing missing is ADC.  If it had 4 ADC pins
rather than the two analog comparators it would be perfect.  The hardware
UART is something I've been wishing for all along.

Dale
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               -- Isaac Asimov

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2001\03\18@140907 by dpharris

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Hi-
Yes, these are nice little chips.  Have built a model train controller using
built-in oscillator, so the whole thing consists of 628, resistors, LCD,
keypad.
You must disable the comparitor pins to be 84 compatible.  Also note, if you
disable MCLR, oscillator, you have almost all the pins for i/o.  Beauty.
David

Dale Botkin wrote:

{Quote hidden}

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2001\03\18@193946 by Jinx

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> The hardware UART is something I've been wishing for all along.
>
> Dale

Me too. I use the AVR2313 for UART, and it's nice to know
there's a second source when the AVRs are off the shelves.
16F628-20P is currently NZ$5.38 per 25, NZ$3+ less than F84A,
and about NZ$1-2 cheaper than the 2313

Only very small niggle I'd have is the F628 UART tables. I prefer
the AVR tables, which have a lot more 0% error listings, rather
than the PIC table which is based on common freqs. Only a small
point, and of course baud rates can be worked out for any xtal,
just easier at a glance with AVR tables

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2001\03\19@081333 by Olin Lathrop

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> Only very small niggle I'd have is the F628 UART tables. I prefer
> the AVR tables, which have a lot more 0% error listings, rather
> than the PIC table which is based on common freqs. Only a small
> point, and of course baud rates can be worked out for any xtal,
> just easier at a glance with AVR tables

It's even easier to have the assembler calculate the baud rate for you.
Check out the UART_BAUD macro in STD.INS.ASPIC, which can be found at
http://www.embedinc.com/pic.


********************************************************************
Olin Lathrop, embedded systems consultant in Littleton Massachusetts
(978) 742-9014, spam_OUTolinTakeThisOuTspamembedinc.com, http://www.embedinc.com

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