PIC Questions

[Jemison Richard]

Thanks Sandy.  Could you give me a couple of PIC types to get me started and
a supplier?

Rick

> -----Original Message-----
> From:	Sandy [SMTP:sganz at wgn.net]
> Sent:	Tuesday, November 03, 1998 7:56 PM
> To:	diy_efi at efi332.eng.ohio-state.edu
> Subject:	RE: PIC Questions
> 
> The PIC is a very simple RISC processor that is good for lots of control
> type
> of applications (lots of other things to). They are inexpensive, and the
> tools
> are low cost. Lots of I/O depending on the model. Limitations in my mind
> are
> memory and not having a traditional 'Bus'. The bad also makes them very
> good
> for smaller projects. The HC11 is a more traditional CPU, lots of I/O easy
> to
> add boat loads of memory, but has the added expense of having too! PIC's
> are
> finding their way into everything, and seem like easy to gets started. The
> PIC
> and HC11 boards are pretty plentyful, with a bit lower cost to the PIC.
> The
> choice would have to be based on cost, size, and how much memory. Their
> are
> lots of addon's for the PIC, but they sort of defeat the simpicity of it.
> So my
> choice would be base on can I do it with just the PIC by itself, if I have
> to
> get a bunch of special addons' I would go with the HC11. Both have similar
> on
> chip functionality, I think the HC11 has some more advanced subsystems
> available, supports interrupts, can run a rtos, etc.
> 
> 2 Cent...
> 
> 
> Sandy
> 
> At 05:57 PM 11/3/98 -0500, you wrote:
> >For us novices, could you briefly explain what a PIC is exactly and
> describe
> >(manufacturer / model / part#) the board you mention.  Also a brief
> >explanation of why you would prefer the PIC board to the HC11 (assuming
> you
> >could find an HC11 board).
> >
> >Thanks
> >
> >Rick
> >
> >> -----Original Message-----
> >> From: Orin Eman [SMTP:orin at WOLFENET.com]
> >> Sent: Tuesday, November 03, 1998 3:20 AM
> >> To: diy_efi at efi332.eng.ohio-state.edu
> >> Subject: Re: PIC Questions
> >> 
> >> 
> >> > Was looking at the HC11' but the PIC is lower cost and easier to get.
> >> Just
> >> > not needing the power of the HC11, just the i/o. Seems that several
> >> PIC's
> >> > have the same I/O capability so that makes is easy.
> >> 
> >> I've looked at HC11 vs PIC too... kept coming back to the PIC.
> >> I also looked at the PIC with more IO vs one with less IO with
> >> some latches... the bigger PIC won easily (pin count!).  I have a
> PIC16C73
> >> based data aquisition board... drives a character LCD and RS232.
> >> I _didn't_ use the on-board AtoD, but used a Motorola 145051 10 bit
> >> chip instead.  I had to do the serial by hand (but the assembler
> >> macro capability is good - I should post the code).  Used the
> >> interrupt on change inputs to aquire ignition timing - interesting
> >> since this feature is buggy on the 16C73.  Picked up a couple
> >> of duty cycles using the capture inputs...
> >> 
> >> Orin.
> >