ATxmega32A4U Atmel Corporation, ATxmega32A4U Datasheet - Page 394

• Manufacturer Part Number: ATxmega32A4U
• Manufacturer: Atmel Corporation

Specifications of ATxmega32A4U

• Flash (kbytes): 32 Kbytes
• Pin Count: 44
• Max. Operating Frequency: 32 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 16
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 34
• Ext Interrupts: 34
• Usb Transceiver: 1
• Usb Speed: Full Speed
• Usb Interface: Device
• Spi: 7
• 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): 1024
• 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

30.3
30.3.1
30.3.2
30.4
30.5
8331A–AVR–07/11
Input Sourcess
Signal Compare
Interrupts and Events
Pin Inputs
Internal Inputs
Figure 30-1. Analog Comparator overview
Each Analog Comparator has one positive and one negative input. Each input may be chosen
among a selection of the analog input pins, internal inputs and a V
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.
All analog input pins on the port can be selected as input to the Analog Comparator.
There are three internal inputs that are 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 are generated for the same condition as the interrupt, and at all times,
regardless of the interrupt being enabled or not.
• Output from the DAC (if available on the device).
• Bandgap reference voltage.
• Voltage scaler that can do a 64-level scaling of the internal V
Voltage
Scaler
Bandgap
DAC
Pin Input
Pin Input
Pin Input
Pin Input
ACnMUXCTRL
ACnCTRL
Enable
Enable
Hysteresis
Hysteresis
Atmel AVR XMEGA AU
Interrupt
Mode
WINCTRL
CC
voltage.
CC
scaled input. The digital
Sensititivity
Function
Interrupt
Window
Control
&
AC0OUT
AC1OUT
Interrupts
Events
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