ATxmega64A4U Atmel Corporation, ATxmega64A4U Datasheet - Page 127
ATxmega64A4U
Manufacturer Part Number
ATxmega64A4U
Description
Manufacturer
Atmel Corporation
Specifications of ATxmega64A4U
Flash (kbytes)
64 Kbytes
Pin Count
44
Max. Operating Frequency
32 MHz
Cpu
8-bit AVR
Hardware Qtouch Acquisition
No
Max I/o Pins
34
Ext Interrupts
34
Usb Transceiver
1
Usb Speed
Full Speed
Usb Interface
Device
Spi
2
Twi (i2c)
2
Uart
5
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
12
Adc Resolution (bits)
12
Adc Speed (ksps)
2000
Analog Comparators
2
Resistive Touch Screen
No
Dac Channels
2
Dac Resolution (bits)
12
Temp. Sensor
Yes
Crypto Engine
AES/DES
Sram (kbytes)
4
Eeprom (bytes)
2048
Self Program Memory
YES
Dram Memory
No
Nand Interface
No
Picopower
Yes
Temp. Range (deg C)
-40 to 85
I/o Supply Class
1.6 to 3.6
Operating Voltage (vcc)
1.6 to 3.6
Fpu
No
Mpu / Mmu
no / no
Timers
5
Output Compare Channels
16
Input Capture Channels
16
Pwm Channels
16
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ATxmega64A4U-AU
Manufacturer:
ON
Quantity:
29 000
Company:
Part Number:
ATxmega64A4U-U
Manufacturer:
ATMEL
Quantity:
74
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11.4
11.5
8331B–AVR–06/11
Window Mode Operation
Watchdog Timer Clock
Figure 11-1. Normal mode operation.
In window mode operation, the WDT uses two different timeout periods, a "closed" window time-
out period (TO
defines a duration of from 8ms to 8s where the WDT cannot be reset. If the WDT is reset during
this period, the WDT will issue a system reset. The normal WDT timeout period, which is also
8ms to 8s, defines the duration of the "open" period duirng which the WDT can (and should) be
reset. The open period will always follow the closed period, and so the total duration of the time-
out period is the sum of the closed window and the open window timeout periods. The default
closed window timeout period is controlled by fuses (both open and closed periods are con-
trolled by fuses). The window mode operation is illustrated in
Figure 11-2. Window mode operation.
The WDT is clocked from the 1kHz output from the 32kHz ultra low power (ULP) internal oscilla-
tor. Due to the ultra low power design, the oscillator is not very accurate, and so the exact
timeout period may vary from device to device. When designing software which uses the WDT,
this device-to-device variation must be kept in mind to ensure that the timeout periods used are
valid for all devices. For more information on ULP oscillator accuracy, consult the device
datasheet.
WDTW
) and the normal timeout period (TO
ATMEL CONFIDENTIAL
Atmel AVR XMEGA AU
WDT
). The closed window timeout period
Figure
11-2.
127
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