Need advice for creating nS time delay

[mister_e]

a single instruction @4Mhz is 1uSec, this will be impossible to be faster for this frequency.

[Acetronics2]

Hi, Sayzer

Depends on the Pic you want to use ... but, if an internal oscillator could be used ( 16F88 i.e. ) ...

you could think to change the osc. frequ by soft !!! ( 8Mhz maxi gives 500 ns ...)

but depends if you could "boost" your osc frequ. for some instructions ...

see 16F88 ( i.e.) datasheet $ 4.6.2 for further infos ...

Alain

[mister_e]

or... eh eh, a 18F and enable/disable the internal PLL on the fly...

[Darrel Taylor]

This won't help Sayzer, but it's another example of why NOT to say RTFD all the time.

I was looking at the timing of a 628A. Trying to see if there was something that might work.
Looked at the capacitor discharge idea using a on-board comparator. But the response time was up to 600ns.
Hmmm, didn't expect them to be that slow.

Then was looking farther and came across this ...
Apparently, you can run a 16F628A at 4Ghz.
A 1ns delay would just be a NOP.

[skimask]

??????????
http://www.picbasic.co.uk/forum/atta...5&d=1197319528

[Darrel Taylor]

I guess it should be RTFCD. (current datasheet)

P.S. Hello skimask.

[Ioannis]

Hi skimask! Where have you been? Its been a long time...

Well about the pin capacitance, I don't think it is a good idea in respect of the difference between chips. The delay won't be standard. If precision is needed don't think about it.

Can you provide more info about your project Sayzer?

Ioannis