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Definition of INTENSET/CLR for TIMER

Bengt Florin

Where to find definition for INTENSET/CLR for TIMERs in 'nRF51_Reference_manual v1.1'? I think I've read it all by now, but still can't find it. After some digging I found it in the 'nrf51_bitfields.h', but it would somehow be nice to read it in Reference Manual as well.

  • 0

    A decision was made to not document the INTEN registers explicitly for any peripheral, since they are all very similar. The feature of each of them is to choose which events in the peripheral will trigger this peripheral's interrupt. Instead of doing this again and again, this is generally described in section 9.1.6 in the Reference Manual.

    The corresponding -SET and -CLR registers is a pattern used to avoid read-modify-write cycles. The feature is explained in section 9.1.2 in the Reference Manual.

    As for a detailed explanation of the INTEN register for the TIMERs, the defines in nrf51_bitfields.h is probably the best. However, once you understand the general pattern, I hope you won't feel the need for an explicit description. The most important point is that with the INTEN register, which is accessed with the set-and-clear-pattern (i.e. through INTENSET and INTENCLR), you can enable and disable each peripheral event's ability to trigger the peripheral's interrupt.

  • 0 in reply to Ole Morten

    Okidooki. Can't say that I agree on that. Reading the docs are far easier than reading h-files for specific bit patterns. However, it could be a fine thing to put in the docs that 'if you are looking for bit definitions for this or that' stop reading the docs and scan the h-file instead. The usage of -SET & -CLR pattern is well understod, but which bit to set or clear is not easily guessed.

  • 0 in reply to Ole Morten

    I see your point, and I'll bring your comment on internally, so it can be considered for a future update. Thanks!

  • 0 in reply to Ole Morten

    Ahh well! Now i understood it...Just tried out to shift a 1 through the INTENSET register until it worked as i wanted it to be. I agree with you, that it isn't described again and again in the Reference manual, but maybe a little hint would be good. Like you gave with your good comment! Greetings Matthias

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