REGIONENCLR Requires delay before taking affect?

[dlip]

If I write to the MWU REGIONENCLR register and immediately access memory that was previously watch enabled an event is still generated.  If I delay a small amount (tested with 1us) before accessing the memory then the event is not generated.  The datasheet does not seem to indicate a delay is required.  How much delay is required?

This can be reproduced after enabling a softdevice by running the following code:

NRF_MWU->REGIONENCLR = ((MWU_REGIONENCLR_RGN0WA_Clear << MWU_REGIONENCLR_RGN0WA_Pos) | (MWU_REGIONENCLR_PRGN0WA_Clear << MWU_REGIONENCLR_PRGN0WA_Pos
NRF_NVMC->CONFIG=1;

[Håkon Alseth]

Hi,

The datasheet does not seem to indicate a delay is required.  How much delay is required?

One 16MHz cycle. Try reading an event, like (void)NRF_TIMER1->EVENTS_COMPARE[0];

 

This is because the peripherals are synched towards the 16 MHz peripheral tree, while the CPU runs on 64 MHz.

 

Kind regards,

Håkon