AT32UC3L0256 Atmel Corporation, AT32UC3L0256 Datasheet - Page 298

• Manufacturer Part Number: AT32UC3L0256
• Manufacturer: Atmel Corporation

Specifications of AT32UC3L0256

• Flash (kbytes): 256 Kbytes
• Pin Count: 48
• Max. Operating Frequency: 50 MHz
• Cpu: 32-bit AVR
• # Of Touch Channels: 17
• Hardware Qtouch Acquisition: Yes
• Max I/o Pins: 36
• Ext Interrupts: 36
• Usb Speed: No
• Usb Interface: No
• Spi: 5
• Twi (i2c): 2
• Uart: 4
• Lin: 4
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 12
• Adc Speed (ksps): 460
• Analog Comparators: 8
• Resistive Touch Screen: No
• Temp. Sensor: Yes
• Crypto Engine: No
• Sram (kbytes): 16
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: Yes
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 1.62 to 3.6
• Operating Voltage (vcc): 1.62 to 3.6
• Fpu: No
• Mpu / Mmu: Yes / No
• Timers: 6
• Output Compare Channels: 18
• Input Capture Channels: 12
• Pwm Channels: 35
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

Figure 15-4. Window Mode WDT Timing Diagram
Figure 15-5. Window Mode WDT Timing Diagram, clearing within T
32145A–12/2011
C L R .W D T C L R
W a tc h d o g re s e t
C L R .W D T C L R
W a tch d o g re se t
t= t
t= t
W rite o n e to
W rite o n e to
0
0
The PSEL and Time Ban Prescale Select (TBAN) fields in the CTRL Register selects the WDT
timeout period
where T
bit is not allowed. Doing so will result in a watchdog reset, the device will receive a reset and the
code will start executing form the boot vector, see
will be cleared.
Writing a one to the CLR.WDTCLR bit within the T
counter starts counting from zero (t=t
If the value in the CTRL Register is changed, the WDT counter will be cleared without a watch-
dog reset, regardless of if the value in the WDT counter and the TBAN value.
If the WDT counter reaches T
and the code will start executing form the boot vector.
T
T
tb a n
tb a n
T
timeout
tban
sets the time period when clearing the WDT counter by writing to the CLR.WDTCLR
= T
tban
+ T
psel
= (2
timeout
(TBAN+1)
, the counter will be cleared, the device will receive a reset
0
), entering T
+ 2
(PSEL+1)
tban
, resulting in watchdog reset.
T
T
p s e l
) / f
pse l
tban
psel
Figure 15-5 on page
clk_cnt
, see
period will clear the WDT counter and the
AT32UC3L0128/256
Figure 15-4 on page
298. The WDT counter
T im e o u t
T im e o u t
298.
298