What is ''Reset temporization''
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‎2018-03-27 3:44 AM
Hello,
STM32 parts define a Reset temporization time (T RSTTEMPO) several 100 us long up to 4.5 ms on STM32F103. I did not find an explanation for this time, but I suspect this is the time from the nRST Pin reaching a valid high level to chip internal reset deasserted. Is this guess right?
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‎2018-03-27 6:02 AM
Hello
Bonnes.Uwe
,This temporization is notimpacting the signal coming from the NRST pin.
It is linked to the POR (Power On Reset), which has a somewhat strongereffect thana regular system reset.
For example, it forces option byte loading and some registers are only reset bya POR (like debug registers)
The POR only happens when powering up and exiting from standby. Other reset sources are not delayed.
The temporization starts when V
DD
crosses theVPOR/PDR
threshold.The only explanation lays in fig.5 page 69 of the
(rev18)This
temporization may be visible on the NRST pin (if the pin is not driven low externally) because it is forced low internallyduring the tempo.
But keep in mind there is a filter on NRST pin to reducenoise sensitivity (seeNRST pin characteristics tablein the datasheet)
This means pulse shorter than 100ns are always filtered out so no reset
This means pulselargerthan 300ns arenever filtered outandtherefore always generate a reset.
In between: it's pure luck...
Best regards,
Max
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‎2018-03-27 7:04 AM
It's actually just a delay.
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‎2018-03-27 8:23 AM
So what does '
temporization' actually mean??
It is a made-up word - so please supply the corresponding definition!
EDIT
or perhaps it is a mis-translation of something?
A complex system designed from scratch never works and cannot be patched up to make it work.
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‎2018-03-27 9:06 AM
https://en.wiktionary.org/wiki/temporization
https://en.wiktionary.org/wiki/temporisation ♯ French
2. (technics)
https://en.wiktionary.org/wiki/timer
(launching an action after a givenhttps://en.wiktionary.org/wiki/delay
)?
ST is a French-Italian company.
JW
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‎2018-03-27 11:23 AM
Then please can the document be revised to say that!
As you can see, the current wording is incomprehensible!
A complex system designed from scratch never works and cannot be patched up to make it work.
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‎2018-03-27 4:05 PM
I wish this be the most incomprehensible wording in the STM32 documents.
Jan
