Re: PIC or Freescale HC08 ??

On Mon, 27 Mar 2006 15:43:41 +0200, "petrus bitbyter" <pieterkraltlaatditweg@xxxxxxxxxxxxxxxxx>
wrote:


<r.laury@xxxxxxxxxxx> schreef in bericht
news:zfGdnb4JbbkxFrrZnZ2dnUVZ_tqdnZ2d@xxxxxxxxxxxxxx
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


Ron,

Most important constraint seems to become pincount. Your keypad and display
will require 23 pins.

But very easy to reduce -
7x7 segs = 14 pins, plus 3 columns for the keypad sharing either the display commons or segments (
with a few diodes or resistors) = 17 pins.

Use an external HC138 and you're down to 13.


.

Relevant Pages

  • Re: PIC or Freescale HC08 ??
    ... To read a keypad with 20 switches. ... Possible control of a brushless servo motor with encoder feedback. ... will require 23 pins. ... display commons or segments ( ...
    (sci.electronics.design)
  • Re: PIC or Freescale HC08 ??
    ... To read a keypad with 20 switches. ... Possible control of a brushless servo motor with encoder feedback. ... Shared lines mean 18 pins max, ... Bigger micro ...
    (sci.electronics.design)
  • Re: PIC or Freescale HC08 ??
    ... To read a keypad with 20 switches. ... Possible control of a brushless servo motor with encoder feedback. ... Shared lines mean 18 pins max, ... Bigger micro ...
    (sci.electronics.design)
  • Re: Im about to blow my brains out (but I need MFC help first)
    ... Hi AliR, ... message to its parent. ... keypad and changes its own data structures if the keypad is used. ... >> happens instead is that the dialog's control handling happens first, ...
    (microsoft.public.vc.mfc)
  • Re: pc wont wake up again
    ... is an older motherboard, which has a 1x3 row of pins, with one ... position for a jumper labeled as +5V and the other position as +5VSB. ... for power control, for all devices that might need power during sleep. ...
    (microsoft.public.windowsxp.general)
Quantcast