SIR System Initialization Registers. 0x40000400 read-only 0x00 0x400 registers SISTAT System Initialization Status Register. 0x00 read-only MAGIC Magic Word Validation. This bit is set by the system initialization block following power-up. 0 1 read-only read magicNotSet Magic word was not set (OTP has not been initialized properly). 0 magicSet Magic word was set (OTP contains valid settings). 1 CRCERR CRC Error Status. This bit is set by the system initialization block following power-up. 1 1 read-only read noError No CRC errors occurred during the read of the OTP memory block. 0 error A CRC error occurred while reading the OTP. The address of the failure location in the OTP memory is stored in the ERRADDR register. 1 ADDR Read-only field set by the SIB block if a CRC error occurs during the read of the OTP memory. Contains the failing address in OTP memory (when CRCERR equals 1). 0x04 read-only ERRADDR 0 32 BTLE_LDO_TRIM BTLE LDO Trim register. 0x48 read-write TX TX LDO trim value. 0 5 read-write RX RX LDO trim value. 8 5 read-write FSTAT funcstat register. 0x100 read-only FPU FPU Function. 0 1 no 0 yes 1 ADC 10-bit Sigma Delta ADC. 2 1 no 0 yes 1 SMPHR SMPHR function. 7 1 no 0 yes 1 SFSTAT Security function status register. 0x104 read-only SECBOOT Security Boot. 0 1 TRNG TRNG Function. 2 1 no 0 yes 1 AES AES Block. 3 1 no 0 yes 1