ATxmega256A3BU Atmel Corporation, ATxmega256A3BU Datasheet - Page 106

• Manufacturer Part Number: ATxmega256A3BU
• Manufacturer: Atmel Corporation

Specifications of ATxmega256A3BU

• Flash (kbytes): 256 Kbytes
• Pin Count: 64
• Max. Operating Frequency: 32 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 16
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 47
• Ext Interrupts: 49
• Usb Transceiver: 1
• Usb Speed: Full Speed
• Usb Interface: Device
• Spi: 8
• Twi (i2c): 2
• Uart: 6
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 16
• Adc Resolution (bits): 12
• Adc Speed (ksps): 2000
• Analog Comparators: 4
• Resistive Touch Screen: No
• Dac Channels: 2
• Dac Resolution (bits): 12
• Temp. Sensor: Yes
• Crypto Engine: AES/DES
• Sram (kbytes): 16
• Eeprom (bytes): 4096
• 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: 7
• Output Compare Channels: 22
• Input Capture Channels: 22
• Pwm Channels: 22
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

8.5.4
8.5.5
8331A–AVR–07/11
Watchdog Timer
Port Pins
If the watchdog timer is not needed in the application, the module should be turned off. If the
watchdog timer is enabled, it will be enabled in all sleep modes and, hence, always consume
power. Refer to
watchdog timer.
When entering a sleep mode, all port pins should be configured to use minimum power. Most
important is to ensure that no pins drive resistive loads. In sleep modes where the Peripheral
Clock (Clk
power is consumed by the input logic when not needed.
PER
) is stopped, the input buffers of the device will be disabled. This ensures that no
”WDT – Watchdog Timer” on page 126
Atmel AVR XMEGA AU
for details on how to configure the
106