19.2.3.2.2 Cortex-M3 Processor in Sleep Mode

The Cortex-M3 processor can be put into a low-power state by entering sleep mode. The processor exits sleep mode when an interrupt occurs. The watchdog timer can be configured to generate an interrupt if its counter value moves from the permitted to the forbidden window (at the WDOGMVRP level) when the Cortex-M3 processor is in sleep mode. The processor wakes up and refreshes the watchdog timer and then goes back into sleep mode. The WDOGWAKEUPINT output from the watchdog timer is used for this interrupt. The WAKEUPINTEN control bit in the Table 19-9 is used to enable/disable generation of the WDOGWAKEUPINT interrupt, with the default setting being disabled.