ATxmega192A3U Atmel Corporation, ATxmega192A3U Datasheet - Page 99

• Manufacturer Part Number: ATxmega192A3U
• Manufacturer: Atmel Corporation

Specifications of ATxmega192A3U

• Flash (kbytes): 192 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): 2048
• 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

7.11
7.11.1
7.11.2
8331A–AVR–07/11
Register Description
CTRL – DFLL Control Register
CALA – DFLL Calibration Register A
tion, the actual clock source that is selected must enabled and configured for the calibration to
function.
Table 7-10.
• Bit 0 – RC2MCREF: 2MHz Oscillator Calibration Reference
This bit is used to select the calibration source for the 2MHz DFLL. By default, this bit is zero and
the 32.768kHz internal oscillator is selected. If this bit is set to one, the 32.768kHz crystal oscil-
lator on TOSC is selected as the reference. This bit will select only which calibration source to
use for the DFLL. In addition, the actual clock source that is selected must enabled and config-
ured for the calibration to function.
• Bit 7:1 – Reserved
These bits are reserved and will always be read as zero. For compatibility with future devices,
always write these bits to zero when this register is written.
• Bit 0 – ENABLE: DFLL Enable
Setting this bit enables the DFLL and auto-calibration of the internal oscillator
The CALA and CALB registers hold the 13-bit DFLL calibration value that is used for automatic
run-time calibration of the internal oscillator. When the DFLL is disabled, the calibration registers
can be written by software for manual run-time calibration of the oscillator. The oscillators will
also be calibrated according to the calibration value in these registers when the DFLL is
disabled.
Bit
+0x02
Read/Write
Initial Value
Bit
+0x00
Read/Write
Initial Value
RC32MCREF[1:0]
–
DFLL32M/DFLL2M
00
01
10
11
R/W
R
7
–
0
7
–
0
32MHz oscillator reference selection.
R/W
R
6
6
–
0
x
Group Configuration
R/W
5
–
R
0
5
x
USBSOF
XOSC32
RC32K
—
R/W
R
4
x
4
–
0
CALA[6:0]
R/W
R
3
Atmel AVR XMEGA AU
Description
32.768kHz internal oscillator
32.768kHz crystal oscillator on TOSC
USB start of frame
Reserved
3
–
0
x
R/W
R
2
–
0
2
x
R/W
R
1
–
0
1
x
ENABLE
R/W
R/W
0
0
0
x
CTRL
CALA
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