TRIMSIR Trim System Initilazation Registers 0x40005400 0x00 0x400 registers RTC System Init. Configuration Register 2. 0x08 RTCX1 RTC X1 Trim. 16 5 RTCX2 RTC X2 Trim. 21 5 LOCK Lock. 31 1 SIR13 System Init. Configuration Register 13. 0x34 SIMOCLKDIV SIMO Clock Divide while in LP mode. 0 2 SIR17 System Init. Configuration Register 17. 0x44 BUCKCLKSELLP BUCK Clock Select Low Power Mode. 6 2