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Forum Index : Microcontroller and PC projects : Pause Command - minimum pause time

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erbp
Senior Member

Joined: 03/05/2016
Location: Australia
Posts: 195

Posted: 07:25am 06 Jun 2020

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I am trying to find out the minimum supported PAUSE time, specifically for a MM2 running at 40MHz. The manual shows:

As a value of 0.2 is used as an example of a fractional PAUSE time, presumably 200 uSec is achievable, but how far lower than that can a MM2 handle?

I presume the minimum would also depend on the MM model & clock speed, so it would be good if there were a table someplace documenting the minimum PAUSE times supported on the various MM / ARMmite models (even if it only provided figures for the default clock speed for those models where the speed can be changed).

Regards,
Phil.

matherp
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Joined: 11/12/2012
Location: United Kingdom
Posts: 10575

Posted: 07:51am 06 Jun 2020

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It is a bit of a meaningless question. You could specify a pause time of 1uS and the processor would do that but the time taken to interpret and parse the command would be significantly longer

If we assume the MM2 executes 25,000 simple Basic instructions a second then a hypothetical PAUSE 0 would take 40uSec to process

On the CMM2 at 270,000 Basic instructions per second the same PAUSE 0 would take just under 4uSec

erbp
Senior Member

Joined: 03/05/2016
Location: Australia
Posts: 195

Posted: 12:27pm 06 Jun 2020

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@matherp - thanks, at least that gives me some idea.

Phil.

robert.rozee
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Joined: 31/12/2012
Location: New Zealand
Posts: 2465

Posted: 01:24pm 06 Jun 2020

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at the other end of the scale... i suspect the maximum delay (2147483647ms, approx 24 days) may be outdated, as it predates the move to 64-bit integers. 292,271,023 years is likely the true upper limit.

is anyone able to test this?

cheers,
rob � :-)

addendum: the CMM2 manual also mentions 24 days � �

Edited 2020-06-06 23:31 by robert.rozee

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