8.4.8.1 Function
The lower 4 Kbytes of the user interface memory map are never secure and are dedicated to the Non-Secure Watchdog (NS_WDT). Above this offset, the user interface is dedicated to the Always Secure Watchdog (PS_WDT).
The TrustZone Watchdog offers a dedicated watchdog to both secure and non-secure worlds.
The TrustZone Watchdog offers a security escalation process based on transmitting interrupts before generating alarms or system reset.
| Peripheral ID | Type | Security |
|---|---|---|
| ID_DWDT_S | User interface Interrupt ID | Secure (except the first 4 Kbytes) |
| ID_DWDT_NS | Interrupt ID only | Non-secure |
| ID_DWDT_ALARM | Interrupt ID only | Secure |
Refer to the section Dual Watchdog Timer (DWDT) for more details.