ATxmega64B3 Atmel Corporation, ATxmega64B3 Datasheet - Page 95

• Manufacturer Part Number: ATxmega64B3
• Manufacturer: Atmel Corporation

Specifications of ATxmega64B3

• 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: 36
• Ext Interrupts: 36
• Usb Transceiver: 1
• Usb Speed: Full Speed
• Usb Interface: Device
• Spi: 2
• Twi (i2c): 1
• Uart: 1
• Segment Lcd: 100
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 12
• Adc Speed (ksps): 2000
• Analog Comparators: 2
• Resistive Touch Screen: No
• 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: 2
• Output Compare Channels: 6
• Input Capture Channels: 6
• Pwm Channels: 6
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

7.11.4
7.11.5
8291A–AVR–10/11
COMP1 – Compare Register Byte 1
COMP2 – Compare Register Byte 2
The COMP1 and COMP2 register pair represent the frequency ratio between the oscillator and
the reference clock. The initial value for these registers is the ratio between the internal oscillator
frequency and a 1.024kHz reference.
• Bit 7:0 – COMP1[7:0]: Compare Register Byte 1
These bits hold byte 1 of the 16-bit compare register.
• Bit 7:0 – COMP2[15:8]: Compare Register Byte 2
These bits hold byte 2 of the 16-bit compare register.
Table 7-11.
Bit
+0x05
Read/Write
Initial Value
Bit
+0x06
Read/Write
Initial Value
Oscillator Frequency (MHz)
R/W
R/W
7
0
7
0
Nominal DFLL32M COMP values for different output frequencies.
R/W
R/W
6
0
6
0
30.0
32.0
34.0
36.0
38.0
40.0
42.0
44.0
46.0
48.0
50.0
52.0
54.0
R/W
R/W
5
0
5
0
R/W
R/W
4
0
4
0
COMP[15:8]
COMP[7:0]
R/W
R/W
3
0
3
0
Atmel AVR XMEGA B
COMP Value (Clk
R/W
R/W
2
0
2
0
R/W
R/W
0xBEBC
0xCDFE
0xA7D8
0xC65D
0xAF79
0xB71B
1
0
1
0
0x7270
0x7A12
0x81B3
0x8954
0x90F5
0x9896
0xA037
RCnCREF
R/W
R/W
0
0
0
0
= 1.024kHz)
COMP1
COMP2
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