Default REGOUT0 resgister value not as expected

[Daniel Reisfeld]

Hi,

According to the NRF52840 product specification document the default value for REGOUT0 is 0xFFFFFFFF.

When powering the VDDH this implies that the VDD power is 1.8V 

However, when using own board powered by VDDH (with no debugger attached), REGOUT0 is 4 and VDD is 3V. 

I need the 1.8V behaviour.

Please advise how this could happen and how to get the 1.8V

Thanks,

Daniel

[Daniel Reisfeld]

OK, thanks Øyvind!

I guess I get the chip preprogrammed from the manufacturer. Once I change the value it indeed stays unchanged.

Best,

Daniel