ATxmega256A3U Atmel Corporation, ATxmega256A3U Datasheet - Page 139

• Manufacturer Part Number: ATxmega256A3U
• Manufacturer: Atmel Corporation

Specifications of ATxmega256A3U

• 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: 50
• Ext Interrupts: 50
• Usb Transceiver: 1
• Usb Speed: Full Speed
• Usb Interface: Device
• Spi: 10
• Twi (i2c): 2
• Uart: 7
• 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

13. I/O Ports
13.1
13.2
8331A–AVR–07/11
Features
Overview
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AVR XMEGA microcontrollers have flexible general purpose I/O ports. One port consists of up to
eight port pins: pin 0 to 7. Each port pin can be configured as input or output with configurable
driver and pull settings. They also implement synchronous and asynchronous input sensing with
interrupts and events for selectable pin change conditions. Asynchronous pin-change sensing
means that a pin change can wake the device from all sleep modes, included the modes where
no clocks are running.
All functions are individual and configurable per pin, but several pins can be configured in a sin-
gle operation. The pins have hardware read-modify-write (RMW) functionality for safe and
correct change of drive value and/or pull resistor configuration. The direction of one port pin can
be changed without unintentionally changing the direction of any other pin.
The port pin configuration also controls input and output selection of other device functions. It is
possible to have both the peripheral clock and the real-time clock output to a port pin, and avail-
able for external use. The same applies to events from the event system that can be used to
synchronize and control external functions. Other digital peripherals, such as USART, SPI, and
timer/counters, can be remapped to selectable pin locations in order to optimize pin-out versus
application needs.
General purpose input and output pins with individual configuration
Output driver with configurable driver and pull settings:
Input with synchronous and/or asynchronous sensing with interrupts and events
Optional pull-up and pull-down resistor on input and Wired-OR/AND configurations
Optional slew rate control
Asynchronous pin change sensing that can wake the device from all sleep modes
Two port interrupts with pin masking per I/O port
Efficient and safe access to port pins
Peripheral clocks output on port pin
Real-time counter clock output to port pin
Event channels can be output on port pin
Remapping of digital peripheral pin functions
– Totem-pole
– Wired-AND
– Wired-OR
– Bus-keeper
– Inverted I/O
– Sense both edges
– Sense rising edges
– Sense falling edges
– Sense low level
– Hardware read-modify-write through dedicated toggle/clear/set registers
– Configuration of multiple pins in a single operation
– Mapping of port registers into bit-accessible I/O memory space
– Selectable USART, SPI, and timer/counter input/output pin locations
Atmel AVR XMEGA AU
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