ATxmega128A3U Atmel Corporation, ATxmega128A3U Datasheet - Page 310
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ATxmega128A3U
Manufacturer Part Number
ATxmega128A3U
Description
Manufacturer
Atmel Corporation
Specifications of ATxmega128A3U
Flash (kbytes)
128 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)
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
7
Output Compare Channels
22
Input Capture Channels
22
Pwm Channels
22
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ATxmega128A3U-AU
Manufacturer:
ATMEL
Quantity:
39
Company:
Part Number:
ATxmega128A3U-MH
Manufacturer:
ATMEL
Quantity:
1
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23.15.6
23.15.7
8331A–AVR–07/11
BAUDCTRLA – Baud Rate Register
BAUDCTRLB – 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. This bit is valid only for master SPI mode.
• Bit 1 – UCPHA: Clock Phase
The UCPHA bit setting determine whether data are sampled on the leading (first) edge or tailing
(last) edge of XCKn. Refer to the
• Bit 7:0 – BSEL[7:0]: Baud Rate Register
These are the lower 8 bits of the 12-bit BSEL value used for USART baud rate setting. BAUDC-
TRLB contains the four most-significant bits. Ongoing transmissions by the transmitter and
receiver will be corrupted if the baud rate is changed. Writing BSEL will trigger an immediate
update of the baud rate prescaler. See the equations in
• Bit 7:4 – BSCALE[3:0]: Baud Rate Scale factor
These bits select the baud rate generator scale factor. The scale factor is given in two's comple-
ment form from -7 (0b1001) to +7 (0b0111). The -8 (0b1000) setting is reserved. See the
equations in
• Bit 3:0 – BSEL[11:8]: Baud Rate Register
These are the upper 4 bits of the 12-bit value used for USART baud rate setting. BAUDCTRLA
contains the eight least-significant bits. 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
Table 23-1 on page
R/W
R/W
7
0
7
0
R/W
R/W
6
0
6
0
BSCALE[3:0]
R/W
R/W
5
0
5
0
293.
”Master SPI Mode Clock Generation” on page 294
R/W
R/W
4
0
4
0
BSEL[7:0]
R/W
R/W
3
0
3
0
Atmel AVR XMEGA AU
Table 23-1 on page
R/W
R/W
2
0
2
0
BSEL[11:8]
R/W
R/W
1
0
1
0
293.
R/W
R/W
0
0
0
0
for details.
BAUDCTRLA
BAUDCTRLB
310
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