ATxmega32A4 Atmel Corporation, ATxmega32A4 Datasheet - Page 92

• Manufacturer Part Number: ATxmega32A4
• Manufacturer: Atmel Corporation

Specifications of ATxmega32A4

• Flash (kbytes): 32 Kbytes
• Pin Count: 44
• Max. Operating Frequency: 32 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 16
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 34
• Ext Interrupts: 34
• Usb Speed: No
• Usb Interface: No
• Spi: 7
• Twi (i2c): 2
• Uart: 5
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 12
• Adc Resolution (bits): 12
• Adc Speed (ksps): 2000
• Analog Comparators: 2
• Resistive Touch Screen: No
• Dac Channels: 2
• Dac Resolution (bits): 12
• Temp. Sensor: Yes
• Crypto Engine: AES/DES
• Sram (kbytes): 4
• Eeprom (bytes): 1024
• 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: 5
• Output Compare Channels: 16
• Input Capture Channels: 16
• Pwm Channels: 16
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

7.11
7.11.1
7.11.2
7.11.3
8077H–AVR–12/09
Register Description - DFLL32M/DFLL2M
CTRL - DFLL Control Register
CALA - Calibration Register A
CALB - Calibration Register B
• 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
CALA and CALB register holds the 13 bit DFLL calibration value that is used for automatic run-
time calibration 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 be cal-
ibrated according to the calibration value in these registers also when the DFLL is disabled.
• Bit 7:0 - CALL[7:0]: DFLL Calibration bits
These bits hold the 7 Least Significant Bits (LSB) of the calibration value for the oscillator. After
reset CALL is set to its middle value, and during automatic runtime calibration of the oscillator
these bits are use to change the oscillator frequency. The bits are controlled by the DFLL when
the DFLL is enabled.
• Bit 7:4 - 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
+0x02
Read/Write
Initial Value
Bit
+0x00
Read/Write
Initial Value
Bit
+0x03
Read/Write
Initial Value
R
7
R
0
7
–
0
R
7
–
0
R
6
R
1
6
–
0
R
6
–
0
R/W
5
–
R
0
5
0
R
5
–
0
R/W
R/W
R
4
0
4
–
0
4
x
CALL[7:0]
R/W
R/W
R
3
0
3
–
0
3
x
CALH[12:8]
R/W
R/W
R
2
–
0
2
0
2
x
R/W
R/W
R
1
–
0
1
0
1
x
XMEGA A
ENABLE
R/W
R/W
R/W
0
0
0
0
0
x
CTRL
CALA
CALB
92