Re: PIC or Freescale HC08 ??

r.laury@xxxxxxxxxxx wrote:
Hi Group:
I've got a project that I'm contemplating that needs:

To read a keypad with 20 switches.
Control 7 digits of 7 seven segment displays.
Generate pulses for a small stepper motor. (full step and micro step)
Possible control of a brushless servo motor with encoder feedback.
Monitor a few simple sensors.
A few hundred bytes of RAM is enough.
Program size with lookup tables ect, should be under 4-6K.
Flash would be nice.

I've never worked with the PIC and looking at their product line up there's just too many to chose from.
I have worked with the Motorola stuff (HC05) but they are not making anymore HC05 parts.
My question is, What PIC would you use to do the above. Or maybe use several PIC's to get the job done?
Or would you just go for one of the bigger HC08's?

Thanks!
Any input appreciated.

RonL


Consider also the AVR series from Atmel, and any one of the bazillion 8051 derivatives out there.

To wade through the mess of different chip styles you can do what I do:

- list your requirements in terms of I/O pins, PMW outputs, ADC inputs (if you need it) and whatever else you need
- sort through your list of microprocessors to get viable candidates
- choose one based on price, your attitude toward the vendor, and any other 'soft' considerations you may have. I always look for a pin-compatible upgrade, unless I know that what I've chosen is severe overkill (in case I look for a lower-price pin-compatible 'downgrade').

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com

Posting from Google? See http://cfaj.freeshell.org/google/
.

Relevant Pages

  • Re: Homebrew breadboard xmtr
    ... Something that dawned on me a little bit slowly is that none of those old xmtrs were set up to operate 40 meters with a 7 Mc xtal. ... Nowadays we have 7 and 14 Mc fundamental xtals abounding so I went the route of reinventing the wheel so to speak. ... Wescott Design Services ... Do you need to implement control loops in software? ...
    (rec.radio.amateur.homebrew)
  • Re: Radio Shack T&A trend
    ... but some effort should be made at a store ... At two different Radio Shacks in central CA, ... Wescott Design Services ... "Applied Control Theory for Embedded Systems" gives you just what it says. ...
    (sci.electronics.basics)
  • Re: Anotehr Basic Q. re: a circuit
    ... "Brightness/Shutdown dualmode control input. ... mandatory to add in the dimmer?, IOW, I can either add in a dimmer, ... Wescott Design Services ...
    (sci.electronics.basics)
  • Re: control law modification
    ... type 1 system or position system. ... Wescott Design Services ... "Applied Control Theory for Embedded Systems" came out in April. ...
    (sci.engr.control)