nRF51822 SPI clock frequency

[Matt Leising]

I was wondering what the SPI clock frequencies were in Hz.

thanks, Matt

[Stefan Birnir Sverrisson]

Hi Matt

The selection of frequencies for the SPI can be seen in section 25.2.8 in the nRF51 Series Reference Manual v2.1, selectable from 125kbps to 8Mbps. If the selected SPI speed is 8Mbps, it means that the SPI clock frequency on a configured CLK pin is 8MHz.

Update 10.11.2015
The 8MHz maximum bit rate in the nRF51 Reference Manual version 2.1 and version 3.0 is misleading. The maximum SPI master bit rate is 4MHz as stated in the nRF51822/nRF51422 PS version 3.1, section 8.9. 8MHz bit rate is out of specification.