ATxmega256A3U Atmel Corporation, ATxmega256A3U Datasheet - Page 371

• 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

28.16.7
28.16.8
28.16.9
8331A–AVR–07/11
TEMP – Temporary register
CALL – Calibration value registers
CALH – Calibration value registers
• Bit 3:0 – CH[3:0]IF: Interrupt flags
These flags are set when the ADC conversion is complete for the corresponding ADC channel. If
an ADC channel is configured for compare mode, the corresponding flag will be set if the com-
pare condition is met. CHnIF is automatically cleared when the ADC channel n interrupt vector is
executed. The flag can also be cleared by writing a one to its bit location.
• Bit 7:0 – TEMP[7:0]: Temporary Register
This register is used when reading 16-bit registers in the ADC controller. The high byte of the 16-
bit register is stored here when the low byte read by the CPU. This register can also be read and
written from the user software.
For more details on 16-bit register access refer to
The CALL and CALH register pair hold the 12-bit value. The ADC is calibrated during production
programming, the calibration value must be read from the signature row and written to the CAL
register from software.
• Bit 7:0 – CAL[7:0]: ADC Calibration value
This is the 8 LSB of the 12-bit CAL value.
• Bits 7:0 - CAL[11:8]: ADC Calibration value
This is the 4 MSB of the 12-bit CAL value.
Bit
+0x07
Read/Write
Initial Value
Bit
+0x0C
Read/Write
Initial Value
Bit
+0x0D
Read/Write
Initial Value
R/W
7
0
R/W
R/W
7
0
7
–
0
R/W
6
0
R/W
R/W
6
0
6
–
0
R/W
5
0
R/W
R/W
5
0
5
–
0
R/W
4
0
R/W
R/W
4
0
4
–
0
TEMP[7:0]
CAL[7:0]
”Accessing 16-bit Registers” on page
R/W
Atmel AVR XMEGA AU
R/W
R/W
3
0
3
0
3
0
R/W
R/W
R/W
2
0
2
0
2
0
CAL[11:8]
R/W
R/W
R/W
1
0
1
0
1
0
R/W
R/W
R/W
0
0
0
0
0
0
12.
TEMP
CAL
CAL
371