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MKW30Z; KSDK board disable hw RTC

Question asked by Lucian Firan on Feb 5, 2017
Latest reply on Feb 15, 2017 by Jorge Antonio Alcala Vazquez

KW40Z_Connectivity_Software_1.0.1 (KSDK_1.3.0); IAR 7.50


How to set-up these files if you want not to use RTC clock.

To disable it.


48QFN, 32QFN,PinName    ,DEFAULT    ,ALT0           ,ALT1 ,ALT2 ,ALT3 ,ALT4 ,ALT5 ,ALT6 ,ALT7

21,        15        ,PTB16        ,EXTAL32K   ,EXTAL32K  ,PTB16 ,— ,I2C1_SCL,— ,TPM2_CH0,— ,—
22,        16        ,PTB17        ,XTAL32K      ,XTAL32K    ,PTB17 ,— ,I2C1_SDA,— ,TPM2_CH1,— ,—


Should  RTC the pins be mux-ed to ALT1 or left default if pin open (NC) ?


Should be modified  BOARD_ClockInit -> BOARD_InitRtcOsc() functions  ?


RTC pins on PCB are left open, should be tied to 3.3V ot GND ?


If the HW RTC is disabled can other sw clock be used instead for time keeping ?


How accurate are other timers if DCDC bypass mode is used ?


Standard time.h lib is supported ?


Best Regards,