Delay with 50nS resolution...

[batee]

I'm working with 18 pin devices (16F88 is what I'm using now, but I'm open to whatever). I need a way to do timing down to about 50nS resolution. By my calculations, with a 20MHz clock, a clock cycle will be 50nS and an instruction cycle will be 200nS. Even if I went with a 40MHz proc, I wouldn't achieve my goal.

Is there a way to do resolution with a (hopefully small/cheap) PIC?

Thanks,

Bryan A. Thompson
[email protected]

[Melanie]

No, not with a PIC at this time.

[BigWumpus]

50ns


Whow !!!

15 meters of lightspeed.... ;-)

[Melanie]

Your calculator is 10.3mm faster than mine....

[Luciano]

Beer slows your reaction time!

In one nanosecond, light travels about 22.26 cm in beer.
(Beer has a refractive index of 1.3466).

In one nanosecond, light travels exactly 29.9792458 cm in a vacuum.
(Refractive index of a vacuum is defined as having a value of 1.0).

In one nanosecond, light travels about 29.89 cm in air.
(Refractive index of air is 1.003).

The exclusion of water from this theory was intentional.
(RI 1.33).


Luciano

[ErnieM]

Of course you can! (And you were worried, right?)

Courtesy Electronic Design mag:

[Design Briefs]
Measure Nanoseconds With A PIC Microcontroller

Jeffrey L. Rothman, Richard Michta
ED Online ID #5649
September 1, 2003

"Based on a PIC16F887 MCU, this circuit described measures pulse lengths from 2 to 950 ns with a 1-ns resolution."

http://www.elecdesign.com/Articles/A...5649/5649.html