AT32UC3A0256 Atmel Corporation, AT32UC3A0256 Datasheet - Page 94

• Manufacturer Part Number: AT32UC3A0256
• Manufacturer: Atmel Corporation

Specifications of AT32UC3A0256

• Flash (kbytes): 256 Kbytes
• Pin Count: 144
• Max. Operating Frequency: 66 MHz
• Cpu: 32-bit AVR
• # Of Touch Channels: 32
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 109
• Ext Interrupts: 109
• Usb Transceiver: 1
• Usb Speed: Full Speed
• Usb Interface: Device + OTG
• Spi: 6
• Twi (i2c): 1
• Uart: 4
• Ssc: 1
• Ethernet: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 384
• Resistive Touch Screen: No
• Dac Channels: 2
• Dac Resolution (bits): 16
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 64
• Self Program Memory: YES
• External Bus Interface: 1
• Dram Memory: sdram
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 3.0-3.6 or (1.65-1.95+3.0-3.6)
• Operating Voltage (vcc): 3.0-3.6 or (1.65-1.95+3.0-3.6)
• Fpu: No
• Mpu / Mmu: Yes / No
• Timers: 10
• Output Compare Channels: 16
• Input Capture Channels: 6
• Pwm Channels: 13
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

32058K AVR32-01/12
15. Watchdog Timer (WDT)
15.1
15.2
15.3
Figure 15-1. Watchdog Timer module block diagram
15.4
15.4.1
15.4.2
15.4.3
Features
Description
Block Diagram
Product Dependencies
Power Management
Debug Operation
Clocks
RCOSC
Rev: 2.3.0.1
•
•
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.
When the WDT is enabled, the WDT remains clocked in all sleep modes, and it is not possible to
enter Static mode.
The WDT prescaler is frozen during debug operation, unless the OCD system keeps peripherals
running in debug operation.
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
Watchdog Timer counter with 16-bit prescaler
Clocked from RC oscillator
Prescaler
32-bit
EN
RC
).
WDT_CTRL
WDT_CLR
Watchdog
Detector
Watchdog Reset
AT32UC3A
94