ATxmega128B1 Atmel Corporation, ATxmega128B1 Datasheet - Page 90

• Manufacturer Part Number: ATxmega128B1
• Manufacturer: Atmel Corporation

Specifications of ATxmega128B1

• Flash (kbytes): 128 Kbytes
• Pin Count: 100
• Max. Operating Frequency: 32 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 16
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 53
• Ext Interrupts: 53
• Usb Transceiver: 1
• Usb Speed: Full Speed
• Usb Interface: Device
• Spi: 3
• Twi (i2c): 1
• Uart: 2
• Segment Lcd: 160
• 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
• Temp. Sensor: Yes
• Crypto Engine: AES/DES
• Sram (kbytes): 8
• 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: 3
• Output Compare Channels: 10
• Input Capture Channels: 10
• Pwm Channels: 10
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

7.10.3
8291A–AVR–10/11
XOSCCTRL – XOSC Control Register
Bit
+0x02
Read/Write
Initial Value
• Bit 3 – XOSCRDY: External Clock Source Ready
This flag is set when the external clock source is stable and is ready to be used as the system
clock source.
• Bit 2 – RC32KRDY: 32.768kHz Internal Oscillator Ready
This flag is set when the 32.768kHz internal oscillator is stable and is ready to be used as the
system clock source.
• Bit 1 – RC32MRDY: 32MHz Internal Oscillator Ready
This flag is set when the 32MHz internal oscillator is stable and is ready to be used as the sys-
tem clock source.
• Bit 0 – RC2MRDY: 2MHz Internal Oscillator Ready
This flag is set when the 2MHz internal oscillator is stable and is ready to be used as the system
clock source.
• Bit 7:6 – FRQRANGE[1:0]: 0.4 - 16MHz Crystal Oscillator Frequency Range Select
These bits select the frequency range for the connected crystal oscillator according to
on page
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.
This function is enabled if the
• Bit 4:0 – XOSCSEL[4:0]: 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
FRQRANGE[1:0]
00
01
10
11
90.
R/W
FRQRANGE[1:0]
7
0
16MHz crystal oscillator frequency range selection.
Group Configuration
R/W
6
0
Table 7-8
12TO16
04TO2
9TO12
2TO9
0.4 - 16 MHz Crystal Oscillator is selected.
X32KLPM
R/W
5
0
for crystal selections. If an external clock or external oscilla-
XOSCSEL[4]
XOSCPWR
R/W
4
0
Typical Frequency
Range
12MHz - 16MHz
0.4MHz - 2MHz
9MHz - 12MHz
2MHz - 9MHz
R/W
3
0
Atmel AVR XMEGA B
R/W
2
0
XOSCSEL[3:0]
Recommended Range for
Capacitors C1 and C2 (pF)
R/W
1
0
100-300
10-40
10-40
10-30
R/W
0
0
Table 7-7
XOSCCTRL
90