ATxmega64A4U Atmel Corporation, ATxmega64A4U Datasheet - Page 292
ATxmega64A4U
Manufacturer Part Number
ATxmega64A4U
Description
Manufacturer
Atmel Corporation
Specifications of ATxmega64A4U
Flash (kbytes)
64 Kbytes
Pin Count
44
Max. Operating Frequency
32 MHz
Cpu
8-bit AVR
Hardware Qtouch Acquisition
No
Max I/o Pins
34
Ext Interrupts
34
Usb Transceiver
1
Usb Speed
Full Speed
Usb Interface
Device
Spi
2
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)
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
5
Output Compare Channels
16
Input Capture Channels
16
Pwm Channels
16
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ATxmega64A4U-AU
Manufacturer:
ON
Quantity:
29 000
Company:
Part Number:
ATxmega64A4U-U
Manufacturer:
ATMEL
Quantity:
74
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23.3
23.3.1
8331A–AVR–07/11
Clock Generation
Internal Clock Generation - The Fractional Baud Rate Generator
The clock used for baud rate generation and for shifting and sampling data bits is generated
internally by the fractional baud rate generator or externally from the transfer clock (XCK) pin.
Five modes of clock generation are supported: normal and double-speed asynchronous mode,
master and slave synchronous mode, and master SPI mode.
Figure 23-2. Clock generation logic, block diagram.
The fractional baud rate generator is used for internal clock generation for asynchronous modes,
synchronous master mode, and master SPI mode operation. The output frequency generated
(f
peripheral clock frequency (f
baud rate (in bits per second) and for calculating the BSEL value for each mode of operation. It
also shows the maximum baud rate versus peripheral clock frequency. BSEL can be set to any
value between 0 and 4095. BSCALE can be set to any value between -7 and +7, and increases
or decreases the baud rate slightly to provide the fractional baud rate scaling of the baud rate
generator.
When BSEL is 0, BSCALE must also be 0. Also, the value 2
of the minimum number of clock cycles a frame requires. For more details, see
Rate Generation” on page
BAUD
PORT_INV
DDR_XCK
XCK
Pin
) is determined by the period setting (BSEL), an optional scale setting (BSCALE), and the
xcko
xcki
f
OSC
Baud Rate
Generator
Register
BSEL
Sync
301.
PER
).
f
Table 23-1 on page 293
BAUD
Detector
Edge
/2
Atmel AVR XMEGA AU
/4
contains equations for calculating the
ABS(BSCALE)
/2
must at most beone half
DDR_XCK
CLK2X
0
1
0
1
”Fractional Baud
0
1
1
0
UMSEL [1]
txclk
rxclk
292
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