running nrf 52832 with external 16 MHz crystal

[yaron]

Hi

nrf 52832 is able to run in 64 MHz using external 32 MHz crystal. I wondered if I can use an external 16 MHz crystal, and get the CPU to run in 32 Mhz.

Thanks Yaron

[MartinBL]

Simple answers:

1. You have to use a 32MHz crystal (16MHz crystals are no longer an option as it used to be on the nRF51).

2. You can only run the CPU at 64MHz.

[yaron]

Hi Martin

I just wonder, why can't the CPU run at 32 MHz? Thanks again

[MartinBL]

Sorry for the late response. We chose not to implement a clock divider because we found 64MHz to be most effective in terms of current consumption and hence we didn't see the need for a clock divider. Using a 64MHz clock will of course execute your tasks faster and overall you want save power reducing the clock speed. Out of curiosity, do your a different reason to reduce the clock speed?

[yaron]

Hi Martin. Thanks for your answer. You are basicly correct, my porpuse is to save current. But since in my code I have some built-in delays (in which lower clock would consume less current), I wanted to test running in lower clock.