ATxmega256A3B Atmel Corporation, ATxmega256A3B Datasheet - Page 330

• Manufacturer Part Number: ATxmega256A3B
• Manufacturer: Atmel Corporation

Specifications of ATxmega256A3B

• 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 Speed: No
• Usb Interface: No
• 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

27.3
27.3.1
27.3.2
27.4
27.5
27.6
8077H–AVR–12/09
Input Channels
Start of Signal Compare
Generating Interrupts and Events
Window Mode
Pin Inputs
Internal Inputs
Each Analog Comparator has one positive and one negative input. Each input may be chosen
among a wide selection of input channels: the analog input pins, internal inputs and a scaled
inputs. The digital output from the Analog Comparator is one when the difference between the
positive and the negative input is positive, and zero when the difference is negative.
The analog input pins on the port can be selected as input to the Analog Comparator.
There are three Internal inputs that are directly available for the Analog Comparator:
In order to start a signal compare, the Analog Comparator must be configured with the preferred
properties and inputs, before the module is enabled to start comparing the two selected inputs.
The result of the comparison is continuous and available for application software and the Event
System.
The Analog Comparator can be configured to generate interrupts when the output toggles, when
output changes from zero to one (rising edge) or when the output changes from one to zero (fall-
ing edge). Events will be generated for the same condition as the interrupt, and at all times,
regardless of the interrupt being enabled or not.
Two Analog Comparators on the same analog port can be configured to work together in Win-
dow 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.
• Output from the DAC (If available on the specific device).
• Bandgap reference voltage.
• Voltage scaler that can do a 64-level scaling of the internal VCC voltage.
XMEGA A
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