Alarm Interrupt

The AST has a device dependent number of independent hardware alarms that can be configured by the user application. These alarms will be triggered on a match with the current clock value, and can be set up to trigger an interrupt, event, or both. The AST can also be configured to clear the clock value on alarm match which will generate an overflow interrupt.


Refer to module configuration at the end of the AST section of the device datasheet for the number of alarms supported.

Whilst in Calendar Mode and using a nominal 1Hz input clock frequency, a register overflow will occur after 64 years.