We have an application with 2 Kinetis KL series processors (MKL03Z8VFG4 and MKL27Z128VFM4). I need to run them in super low power sleep mode with the RTC running. We basically want the RTC on one clocking the other in super low power mode.
Will running the KL27 with the 32Khz xtal then connecting the RTC_CLKOUT to the RTC_CLKIN on my KL03 allow them to both run in the lowest power mode? Or do they both need 32Khz xtals to achieve the extremely low power I require?