When the chip enters system on mode, can the softdevice still operate normally？

[helen]

Hi

      I want to konw what will softdevice or ble do after the chip enters system on mode.How do I know which components are working during advertise and connection intervals?Is the advertise and connection interval equivalent to system on?

[Hung Bui]

Hi Hellen, 

Please be noted that the nRF5 device only has two mode System ON and System OFF. When in System OFF all peripherals are turned off except for the reset resources.

This mean in most of the operational mode it stays in System ON. 

You can find a list of peripherals that's used by the softdevice when it's active here.

Note that when BLE is not active (not advertising, nor handling a connection event) it's mainly only the LFCLK is active and nothing else. 

[helen]

Hi

       Which timer counts the connection interval and Advertise interval?

[Hung Bui]

Hi Helen, 
You can find the list here: https://infocenter.nordicsemi.com/topic/sds_s132/SDS/s1xx/sd_resource_reqs/hw_block_interrupt_vector.html?cp=4_7_3_0_6_0

Basically it's TIMER0 for radio activity (when the softdevice transmitting) and RTC0 for time keeping (when the softdevice is inactive)