ATxmega256A3 Atmel Corporation, ATxmega256A3 Datasheet - Page 129

• Manufacturer Part Number: ATxmega256A3
• Manufacturer: Atmel Corporation

Specifications of ATxmega256A3

• 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 Speed: No
• Usb Interface: No
• 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
8077H–AVR–12/09
Features
Overview
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XMEGA has flexible General Purpose I/O (GPIO) Ports. A port consists of up to 8 pins ranging
from pin 0 to 7, where each pin can be configured as input or output with highly configurable
driver and pull settings. The ports also implement several functions including interrupts, synchro-
nous/asynchronous input sensing and asynchronous wake-up signalling.
All functions are individual per pin, but several pins may be configured in a single operation. All
ports have true Read-Modify-Write (RMW) functionality when used as general purpose I/O ports.
The direction of one port pin can be changed without unintentionally changing the direction of
any other pin. The same applies when changing drive value when configured as output, or
enabling/disabling of pull-up or pull-down resistors when configured as input.
Figure 13-1 on page 130
controlling a pin.
Selectable input and output configuration for each pin individually
Flexible pin configuration through dedicated Pin Configuration Register
Synchronous and/or asynchronous input sensing with port interrupts and events
Asynchronous wake-up signalling
Highly configurable output driver and pull settings:
Slew rate control
Flexible pin masking
Configuration of multiple pins in a single operation
Read-Modify-Write (RMW) support
Toggle/clear/set registers for OUT and DIR registers
Clock output on port pin
Event Channel 0 output on port pin 7
Mapping of port registers (virtual ports) into bit accessible I/O memory space
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Totem-pole
Pull-up/-down
Wired-AND
Wired-OR
Bus keeper
Inverted I/O
shows the I/O pin functionality, and the registers that is available for
XMEGA A
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