ATxmega256A3BU Atmel Corporation, ATxmega256A3BU Datasheet - Page 395

• 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

30.6
30.7
30.8
8331A–AVR–07/11
Window Mode
Input hysteresis
Propagation delay vs. Power consumption
Two Analog Comparators on the same port can be configured to work together in Window
Mode. In this mode a voltage range may be defined, and the Analog Comparators may give
information about whether an input signal is within this range or not.
Figure 30-2. The Analog Comparators in Window Mode
Application software can select between no, low, and high hysteresis. Adding hysteresis can
avoid constant toggling of the output if the input signals are close to each other and some noise
exists in either of the signals or in the system.
It is possible to enable a high-speed mode to get the shortest possible propagation delay. This
mode consumes more power than the default low-power mode that has a longer propagation
delay.
Upper limit of window
Input signal
Lower limit of window
+
+
-
-
AC0
AC1
Atmel AVR XMEGA AU
sensitivity
Interrupt
control
Interrupts
Events
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