Catching a short spike / event?

[Acetronics2]

Thank you - where would I find this info? I looked over the data sheet and didn't see it - maybe I missed it someplace? Is it in one of the errata publications for the chip? Seems like it would have been an obvious spec to publish - thus I was surprised not to find it.

Thank you.

Hi, Kevj

No secret ... Midrange ref. Manual, Section 30+ ...

Alain

[kevj]

Hi, Kevj

No secret ... Midrange ref. Manual, Section 30+ ...

Alain

Was that comment supposed to come off as sarcastic and demeaning?



Anyway.....


I assume you were referring to this manual (which was a secret to me - I had no idea this manual or the others in this list existed until you pointed out my ignorance for me).

http://ww1.microchip.com/downloads/e...Doc/33023a.pdf

A bunch more manuals:

http://www.microchip.com/stellent/id...GE&nodeId=1956


Section 30 of the noted manual is Electrical Specifications. I didn't see the measurement I needed specifically spelled out. Page 591 does note what appears to be a CCP low input time (by the graphic I assume this means the minimum time the pulse can be low and still be counted) as ".5Tcy +20" with no prescailer, but I don't know what Tcy is - but notes 10ns with the 16Cxxx when using a prescaler - does a prescailer of "1" still count? And why would that be shorter than with no prescailer and while we're there.... where are the measurements for the 16F - these are for the C.



At any rate, I'm going to try and catch this pulse with a 555 / 7555. I'm not aware of any specific monostables that are faster - if someone's got a part number, I'd much appreciate it. Any other ideas on flagging this event - I'm all about listening and experimenting if pointed in the right direction.

[Acetronics2]

[QUOTE=kevj;46506]Was that comment supposed to come off as sarcastic and demeaning?



Hi,

Was just to show you there's no hidden info, but we have a lot of datas to read ... only needs years of practice to remember all these little (! ) details.

it's Everyone's pain !!! not only yours ...

Alain