Power consumption in a defined state (ie, all peripherals enabled, no
peripherals enabled, at a certian speed and voltage, and in various power saving
modes), or power per MIPS.  (ie, I want to be able to say, "Give me an 8-bit
processor which, at 5MIPS consumes less than 20mA @ 5v" (or combined, say each
mips takes 25mW))

Speed range (DC-2THz, for instance ;-)

Average # of clocks per instruction.  (direct, as in 45% of instructions take
two cycles, 5% three, and 50% one, the avg. # is 1.55 clocks per instruction)

Peripherals:
 A/D (bits and channels, external Vref)
 Compare (resolution, channels)
 Capture ("           " )
 ...

External address space (how large without banking? How many instructions does it
take to access it?)

Oscillator options (how many, external and internal, etc)

How much current can the I/O handle

How fast to program entire chip

Package options

Cost (Say, digikey one-off price and a local supplier's 1000 lot price)

%of postings on piclist that have referenced this chip specifically

%of postings on piclist that have referenced this chip's family (16f8xx, or 8x,
etc)

Chips which are similar to this one in a flash or non-flash version

Program space, registers, RAM, EEPROM

And everything else (of course).

Good luck!

-Adam

j newton wrote:
>
> I've been thinking about putting together a better version of some of the
> chip selector web sites that are available on the web to target the PIC and
> PIC like processors. Something that will allow one to quickly narrow down a
> list of all the available processors to those that are applicable and then
> get the detailed information about each chips for the features that are
> critical to your application without having to read the entire datasheet.
>
> My question are:
>
> A) What do you need to know to select a uC? Not just "how many IO pins?" or
> "how fast is it?" but the more detailed things that you find yourself
> scanning the data sheets for, or that you missed when you selected a device
> and only found out about later.
>
> B) How have the data sheets let you down or how would you improve them?
>
> C) How have the "chip selectors" let you down or how would you improve them?
>
> D) What features would motivate you to change from one processor to another
> despite having to learn the "ins and outs" of the new chip? That is very
> important, I think, because it does no good to advise someone that a PIC
> 18C242 would match their needs better than a 16C73 if they are not also
> aware of the differences between them in terms of what they need to know and
> have to make that switch.
>
> I'm very serious about doing this, so rest assured that your input will find
> its way into something that is hopefully useful.
>
> ---
> James Newton (PICList Admin #3)
> mailto:jamesnewton@piclist.com 1-619-652-0593
> PIC/PICList FAQ: http://www.piclist.com or .org
>
> --
> http://www.piclist.com hint: The PICList is archived three different
> ways.  See http://www.piclist.com/#archives for details.

--
http://www.piclist.com hint: The PICList is archived three different
ways.  See http://www.piclist.com/#archives for details.