ATxmega256A3U Atmel Corporation, ATxmega256A3U Datasheet - Page 411

• 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

32.3
8331A–AVR–07/11
PDI Physical
1149.1 compliant, and supports boundary scan. Any external programmer or on-chip debug-
ger/emulator can be directly connected to either of these interfaces. Unless otherwise stated, all
references to the PDI assume access through the PDI physical layer.
Figure 32-1. The PDI with JTAG and PDI physical layers and closely related modules (grey).
The PDI physical layer handles the low-level serial communication. It uses a bidirectional, half-
duplex, synchronous serial receiver and transmitter (just as a USART in USRT mode). The
physical layer includes start-of-frame detection, frame error detection, parity generation, parity
error detection, and collision detection.
In addition to PDI_CLK and PDI_DATA, the PDI_DATA pin has an internal pull resistor, V
GND must be connected between the External Programmer/debugger and the device.
32-2 on page 411
Figure 32-2. PDI connection.
The remainder of this section is intended for use only by third parties developing programmers
or programming support for Atmel AVR XMEGA devices.
PDI_CLK
PDI_DATA
TDI
TMI
TCK
TDO
Program and Debug Interface (PDI)
(physical layer)
(physical layer)
JTAG Physical
PDI_DATA
shows a typical connection.
PDI Physical
PDI_CLK
Vcc
Vcc
Connector
Controller
PDI
Atmel AVR XMEGA AU
PDIBUS
Internal Interfaces
Controller
Memories
OCD
NVM
NVM
CC
Figure
and
411