power for radio state DISABLED

[Jeff]

It appears the nRF51822 Product Spec does not list the current nor power for the radio DISABLED state. The Reference manual description of the state is “No operations are going on inside the radio and the power consumption is at a minimum”. I understand it is minimum but what is the actual value?

Expanding on the radio states, when the radio is unpowered, that is NRF_RADIO->POWER = 0, do radio registers retain their value? Is it valid to read and write the radio registers when the radio is off, NRF_RADIO->POWER = 0?

[Susheel Nuguru]

For your first question I do not have a direct answer, but you can calculate it yourself by measuring the current before and after powering on radio.

NRF_RADIO->POWER control the state of the regulator that drives the radio. Setting NRF_RADIO->POWER = 0, means that regulator is switched off and hence any reads from this registers will have undefined values.

[Jeff]

Say the radio registers are written while the radio is enabled. Then the radio is disabled and then re-enabled? What is the state of the registers when radio is re-enabled after the disable?

[Susheel Nuguru]

enabling and disabling(TASKS_XXEN and TASKS_DISABLE) is different from powering radio on and off. The registers values are only reset on NRF_RADIO->POWER = 1. After that enabling and disabling will retain their values.

When you do NRF_RADIO->POWER = 0, then the register values are undefined. This is why the values are reset when the RADIO is powered on to bring them to a defined state.

[Marco]

In my case, if I perform

NRF_RADIO->POWER = 0;

my nRF52 halts and stop the execution instantaneously.

Can anyone explain why?

Thank you