ATxmega64A3U Atmel Corporation, ATxmega64A3U Datasheet - Page 96

• Manufacturer Part Number: ATxmega64A3U
• Manufacturer: Atmel Corporation

Specifications of ATxmega64A3U

• Flash (kbytes): 64 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): 4
• 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

8331A–AVR–07/11
Table 7-7.
• Bit 5 – X32KLPM: Crystal Oscillator 32.768kHz Low Power Mode
Setting this bit enables the low power mode for the 32.768kHz crystal oscillator. This will reduce
the swing on the TOSC2 pin.
• Bit 4 – XOSCPWR: Crystal Oscillator Drive
Setting this bit will increase the current in the 0.4MHz - 16MHz crystal oscillator and increase the
swing on the XTAL2 pin. This allows for driving crystals with higher load or higher frequency
than specfiied by the FRQRANGE bits.
• Bit 3:0 – XOSCSEL[3:0]: Crystal Oscillator Selection
These bits select the type and start-up time for the crystal or resonator that is connected to the
XTAL or TOSC pins. See
tor is selected as the source for the system clock, see
page
Table 7-8.
Notes:
FRQRANGE[1:0]
XOSCSEL[3:0]
94. This configuration cannot be changed.
0000
0010
0011
0111
1011
1. This option should be used only when frequency stability at startup is not important for the
2. This option is intended for use with ceramic resonators. It can also be used when the fre-
3. When the external oscillator is used as the reference for a DFLL, only EXTCLK and 32KHZ
00
01
10
11
application. The option is not suitable for crystals.
quency stability at startup is not important for the application.
can be selected.
16MHz crystal oscillator frequency range selection.
External oscillator selection and start-up time.
Group Configuration
Group Configuration
Table 7-8
XTAL_256CLK
XTAL_1KCLK
XTAL_16KCLK
12TO16
04TO2
9TO12
2TO9
EXTCLK
32KHZ
for crystal selections. If an external clock or external oscilla-
(3)
(3)
(2)
(1)
Typical Frequency
Range
12MHz - 16MHz
0.4MHz - 2MHz
9MHz - 12MHz
2MHz - 9MHz
Selected Clock Source
Atmel AVR XMEGA AU
0.4MHz - 16MHz XTAL
0.4MHz - 16MHz XTAL
0.4MHz - 16MHz XTAL
32.768kHz TOSC
”CTRL – Oscillator Control Register” on
External Clock
Recommended Range for
Capacitors C1 and C2 (pF)
100-300
10-40
10-40
10-30
Start-up Time
16K CLK
16K CLK
256 CLK
1K CLK
6 CLK
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