Interrupts

The tamper detection of RTC has the following interrupt source:

• Tamper (TAMPER): Indicates detection of a valid signal on a tamper input pin or tamper event input.

The interrupt source has an interrupt flag associated with it. The interrupt flag in the Interrupt Flag Status and Clear (INTFLAG) register is set when the interrupt condition occurs. Each interrupt can be individually enabled by setting the corresponding bit in the Interrupt Enable Set register (INTENSET=1), and disable by setting the corresponding bit in the Interrupt Enable Clear register (INTENCLR=1).

An interrupt request is generated when the interrupt flag is raised and the corresponding interrupt is enabled. The interrupt request remains active until either the interrupt flag is cleared, the interrupt is disabled, or the RTC is reset. See the description of the INTFLAG registers in the device datasheet for details on how to clear interrupt flags.

All interrupt requests from the peripheral are ORed together on system level to generate one combined interrupt request to the NVIC. Refer Nested Vector Interrupt Controller in the device datasheet for more details. The user must read the INTFLAG register to determine which interrupt condition is present.

Note: Interrupts must be globally enabled for interrupt requests to be generated. Refer Nested Vector Interrupt Controller in the device datasheet for more details.