ATxmega256A3 Atmel Corporation, ATxmega256A3 Datasheet - Page 307

• 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

25.16.7
25.16.8
25.16.9
25.16.10 CHnRESH - ADC Channel n Result register High
8077H–AVR–12/09
TEMP - ADC Temporary register
CALL - ADC Calibration value registers
CALH - ADC Calibration value registers
• Bits 7:0 - TEMP[7:0]: ADC 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
page
The CALL and CALH register pair hold the 12-bit value ADC calibration value CAL. 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.
• Bits 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.
The CHnRESL and CHnRESH register pair represents the 16-bit value CHnRES. For details on
reading 16-bit register refer to
12-bit, left
12-bit, right
8-bit
Bit
+0x07
Read/Write
Initial Value
Bit
+0x0C
Read/Write
Initial Value
Bit
+0x0D
Read/Write
Initial Value
12.
Bit
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
7
0
-
-
Section 3.11 ”Accessing 16-bits Registers” on page
R/W
5
0
R/W
R/W
5
0
5
0
-
R
6
0
-
-
R/W
4
0
R/W
R/W
4
0
4
0
-
R
5
0
-
-
TEMP[7:0]
CAL[7:0]
Section 3.11 ”Accessing 16-bits Registers” on
R/W
R/W
R/W
3
0
3
0
3
0
R
4
0
-
-
CHRES[11:4]
R/W
R/W
R/W
2
0
2
0
2
0
R
3
0
-
CAL[11:8]
R/W
R/W
R/W
1
0
1
0
1
0
R
2
0
-
CHRES[11:8]
XMEGA A
R/W
R/W
R/W
0
0
0
0
0
0
R
1
0
-
12.
TEMP
CAL
CAL
R
0
0
-
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