ATxmega256A3U Atmel Corporation, ATxmega256A3U Datasheet - Page 251

• 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

20.13.13 CALL – Calibration Low Byte
20.13.14 CALH – Calibration High byte
8331A–AVR–07/11
• Bit 7:2 – Reserved
These bits are unused and reserved for future use. For compatibility with future devices, always
write these bits to zero when this register is written.
• Bit 1 – TRNIF: Transaction Complete Interrupt Flag
This flag is when there is a pending packet interrupt in the FIFO.
• Bit 0 – SETUPIF: SETUP Transaction Complete Interrupt Flag
This flag is set when a SETUP transaction has completed successfully.
CALL and CALH holds the 16-bit value CAL. The USB PADs (D- and D+) are calibrated during
production to enable operation without requiring external components on the USB lines. The cal-
ibration value is stored in the signature row of the device, and must be read from here and
written to the CAL registers from software.
• Bit 7:0 – CAL[7:0]: PAD Calibration Low Byte
This byte holds the 8 LSB of the CAL.
• Bit 7:0 – CAL[15:8]: PAD Calibration High Byte
This byte holds the 8 MSB of the CAL.
Bit
++0x3A
Read/Write
Initial Value
Bit
+0x3B
Read/Write
Initial Value
R/W
R/W
7
0
7
0
R/W
R/W
6
0
6
0
R/W
R/W
5
0
5
0
R/W
R/W
4
0
4
0
CAL[15:8]
CAL[7:0]
Atmel AVR XMEGA AU
R/W
R/W
3
0
3
0
R/W
R/W
2
0
2
0
R/W
R/W
1
0
1
0
R/W
R/W
0
0
0
0
CALL
CALH
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