[time-nuts] A Simple PIC Divider
Hal Murray
hmurray at suespammers.org
Mon Aug 7 01:09:56 UTC 2006
> Right, this is essentially what my (and any other) PIC divider does.
> Simple, isn't it?
> And those 8-pin PICs are too cute to pass up.
Yup. I saw the light when I was trying to work out a 1/2 second delay with
something like a 555. I couldn't quite get what I wanted. Simple in
software. Saves board space too.
DigiKey sells the PICKit 2 for $35. I haven't used it. It's USB powered.
Looks like it may have a small board for programming so you can program chips
if you include a socket on your board. Another approach is to include a
programming header on your board.
The older version (PICKIt 1?) had an 8/14 pin socket and could program a few
of the low cost chips. They were the PIC16F630/676 and PCI12F629/675. The
630/676 have 14 pins. The 629/675 have 8 pins. One of each pair had a 10
bit A/D.
I don't think any of those chips has a serial port. You would have to do
(heroic) bit-banging if you needed that.
The other series of low cost small CPUs I've worked with is the AVR parts
from Atmel. The ATSTK500 is $80 at Digikey. It programs most (all?) of the
AVR parts. It uses a wall wart and serial cable.
Both vendors offer free Windows software. With a bit of poking around you
can find versions of GCC or assemblers that support the chips you are
interested in. I'm not sure about programming from non-Windows systems.
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