ATxmega64A1 Atmel Corporation, ATxmega64A1 Datasheet - Page 254
ATxmega64A1
Manufacturer Part Number
ATxmega64A1
Description
Manufacturer
Atmel Corporation
Specifications of ATxmega64A1
Flash (kbytes)
64 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
78
Ext Interrupts
78
Usb Speed
No
Usb Interface
No
Spi
12
Twi (i2c)
4
Uart
8
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
4
Dac Resolution (bits)
12
Temp. Sensor
Yes
Crypto Engine
AES/DES
Sram (kbytes)
4
Eeprom (bytes)
2048
Self Program Memory
YES
External Bus Interface
1
Dram Memory
sdram
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
8
Output Compare Channels
24
Input Capture Channels
24
Pwm Channels
24
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
Available stocks
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21.15.6
21.15.7
8077H–AVR–12/09
BAUDCTRLA - USART Baud Rate Register
BAUDCTRLB - USART Baud Rate Register
• Bit 2 - UDORD: Data Order
This bit sets the frame format. When written to one the LSB of the data word is transmitted first.
When written to zero the MSB of the data word is transmitted first. The Receiver and Transmitter
use the same setting. Changing the setting of UDORD will corrupt all ongoing communication for
both receiver and transmitter.
• Bit 1 - UCPHA: Clock Phase
The UCPHA bit setting determine if data is sampled on the leading (first) edge or tailing (last)
edge of XCKn. Refer to the
• Bit 7:0 - BSEL[7:0]: USART Baud Rate Register
This is a 12-bit value which contains the USART baud rate setting. The BAUDCTRLB contains
the four most significant bits, and the BAUDCTRLA contains the eight least significant bits of the
USART baud rate. Ongoing transmissions by the Transmitter and Receiver will be corrupted if
the baud rate is changed. Writing BAUDCTRLA will trigger an immediate update of the baud rate
prescaler.
• Bit 7:4 - BSCALE[3:0]: USART Baud Rate Scale factor
These bits select the Baud Rate Generator scale factor. The scale factor is given in two's com-
plement form from -7 (0b1001) to 7 (0b0111). The -8 (0b1000) setting is reserved. For positive
scale values the Baud Rate Generator is prescaled by 2
Rate Generator will use fractional counting, which increases the resolution. See equations in
Table 21-1 on page
• Bit 3:0 - BSEL[3:0]: USART Baud Rate Register
This is a 12-bit value which contains the USART baud rate setting. The BAUDCTRLB contains
the four most significant bits, and the BAUDCTRLA contains the eight least significant bits of the
USART baud rate. Ongoing transmissions by the Transmitter and Receiver will be corrupted if
the baud rate is changed. Writing BAUDCTRLA will trigger an immediate update of the baud rate
prescaler.
Bit
+0x07
Read/Write
Initial Value
Bit
+0x06
Read/Write
Initial Value
R/W
R/W
7
0
7
0
238.
R/W
R/W
6
0
6
0
BSCALE[3:0]
”SPI Clock Generation” on page 239
R/W
R/W
5
0
5
0
R/W
R/W
4
0
4
0
BSEL[7:0]
R/W
R/W
3
0
3
0
BSCALE
R/W
R/W
2
0
2
0
BSEL[11:8]
. For negative values the Baud
for details.
R/W
R/W
1
0
1
0
XMEGA A
R/W
R/W
0
0
0
0
BAUDCTRLA
BAUDCTRLB
254
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