17.2.3.4 RTC_WAKEUP Output

The RTC_WAKEUP output is asserted whenever the Alarm system is enabled (alarm_enable), the mode wake_enable (Table 17-8) is set and a match occurs by the RTCCLK rising edge. The bit stays set until cleared by writing to the control register clear wakeup bit. The output de assertion is immediate and synchronous to the PCLK.

The RTC_WAKEUP output can be routed to the fabric through the Fabric Interface Interrupt Controller (FIIC) block in MSS and can be used by a soft microcontroller or a state machine implemented in the fabric. It can also be routed to the Cortex-M3 processor Nested Vectored Interrupt Controller (NVIC) or it can be routed to the system controller. The RTC_WAKEUP_CR in the SYSREG block provides masking for the RTC_WAKEUP interrupt to the fabric, the Cortex-M3 processor, and the system controller.