Техническая Спецификация для Atmel Evaluation Kit for AT32uC3A0512, 32-Bit AVR Microcontroller Atmel ATEVK1105 ATEVK1105
Модели
ATEVK1105
94
AT32UC3A
15. Watchdog Timer (WDT)
Rev: 2.3.0.1
15.1
Features
•
Watchdog Timer counter with 16-bit prescaler
•
Clocked from RC oscillator
15.2
Description
The Watchdog Timer (WDT) has a prescaler generating a timeout period. This prescaler is
clocked from the RC oscillator. The watchdog timer must be periodically reset by software within
the timeout period, otherwise, the device is reset and starts executing from the boot vector. This
allows the device to recover from a condition that has caused the system to be unstable.
15.3
Block Diagram
Figure 15-1.
Watchdog Timer module block diagram
15.4
Product Dependencies
15.4.1
Power Management
When the WDT is enabled, the WDT remains clocked in all sleep modes, and it is not possible to
enter Static mode.
15.4.2
Debug Operation
The WDT prescaler is frozen during debug operation, unless the OCD system keeps peripherals
running in debug operation.
15.4.3
Clocks
The WDT can use the internal RC oscillator as clock source. This oscillator is always enabled
whenever these modules are active. Please refer to the Electrical Characteristics chapter for the
characteristic frequency of this oscillator (f
RC
).
RCOSC
WDT_CLR
Watchdog
Detector
WDT_CTRL
32-bit
Prescaler
Watchdog Reset
EN
32058K
AVR32-01/12