main clock control

RE: main clock control

Ole Morten — Wed, 19 Feb 2014 10:39:55 GMT

You can see in section 8.3 which modules of the nRF51 uses which clock and regulator sources. For GPIO, if you want to wake up the chip with a low current consumption, you should use the PORT event. You can take a look at this repository for examples of it: https://github.com/NordicSemiconductor/nrf51-powerdown-examples Also this question may be useful: https://devzone.nordicsemi.com/index.php/is-it-possible-to-create-a-gpio-button-interrupt-without-gpiote

RE: main clock control

hjjeon — Wed, 19 Feb 2014 04:12:06 GMT

Dear Morten,thank for your reply,I have one question. Do I have to disable gpio and uart close and spi close? our device use the uart,spi,gpio. If so, how can I take gpio signal? gpio pin is used user detect pin.

RE: main clock control

Ole Morten — Mon, 17 Feb 2014 14:08:15 GMT

Unless you specifically request the HFCLK to be running (for example using sd_clock_hfclk_request()), the 16 MHz clock will be turned off whenever possible. Take a look at this question for information on how this works.

In summary, you should make sure to disable all peripherals whenever they're not actually needed.