If you need speed in a pic project, consider a Senix SX. At 50MIPS, (50Mhz
clock, one clock cycle per instruction) it is over 20 times faster than the
PICs. They can be programmed in the same way the PICs are and are code and
pin compatible. They cost a little more, and I would recommend getting the
SXKey (cheap $150) true ICE from http://www.parallaxinc.com so you can watch
your programs run in the production device and debug (even after product
release) as every production chip has the ICE built in.

Before anybody yells at me about touting SX chips or not marking this [OT]:
Think about it, they ARE PIC's (CODE and PIN compatible) and Nils was asking
for SPEED which is where the SX chips rule.

James Newton mailto:jamesnewton@geocities.com phone:1-619-652-0593)
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-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Nils Olav Selesdal
Sent: Friday, October 01, 1999 4:02 AM
To: PICLIST@MITVMA.MIT.EDU
Subject: Capture Speed


I'm working at a project where i'll use the Capture function.
There is two inputs,who'll detect(cature) a rising flank)

The idea is in the main program a counter runs(as fast as possible)!
I'll :
   -capture one rising flank,
   -store the currently value in the counter.

   -a time delay

   -capture the next rising flank on the other
   -store the currently value in the counter

   (reset all values and do this over again)

The idea is that the time delay is as short as possible, but the counter
must have increased with +1 (atleast).

How fast can this time delay be?(atleast 1uS??)  Which PIC to use?

Can I set a 10 MHz PIC to run at a higher speed?( I really need speed for
this task!)


[nOs]