How to power cycle NFCT?

[tkorsdal]

From the Nordic errata [141] on NFCT not stopping HFO when going from activated state to sense state:

Workaround: Power cycle the NFCT using the POWER register, then issue the SENSE task to enter SENSE mode.

What POWER register is referred to?

[tkorsdal]

Found this in hal_nfc_t2t.c of a nfc example:

#define NRF_NFCT_POWER  (*(uint32_t volatile *)(0x40005FFC))

It seems to do the trick.

Is this register documented somewhere?

[FormerMember]

Unfortunately, the register is not documented anywhere. However, the functionality of the register is the following:

• '0' (disabled): The peripheral is powered off
• '1' (enabled): The peripheral is powered on

Comment: If disabling, then enabling this register, the NFC peripheral and its registers will be reset to its initial state.