CHAPTER 2-1: Clock
60 FM4 Peripheral Manual, Doc. No. 002-04856 Rev. *E
Notes:
− This register is not initialized by software reset.
− When you change the clock mode, you should set the enable bit to transition for desired clock
oscillation. Then, you can change the clock switch control bits (SCM_CTL:RCS[2:0]).
− When RTCE bit (PMD_CTL:RTCE) is 1, it becomes a sub clock oscillation enable state
regardless of the SOSCE bit and SORDY bit values.
− Writing "1" to RTCE bit (PMD_CTL:RTCE) is enabled only when SORDY bit is 1.
− RTCE bit (PMD_CTL:RTCE) does not exist in the products that do not have RTC mode and deep
standby RTC mode. See Table 1-1 in the Chapter Low Power Consumption Mode.
− First of all, after the power supply is turned on, it is required to set the register of VBAT RTC for
enabling the sub-clock oscillation. For the sub-clock oscillation enable, see Figure 4-2.
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