ATxmega256A3U Atmel Corporation, ATxmega256A3U Datasheet - Page 308

• Manufacturer Part Number: ATxmega256A3U
• Manufacturer: Atmel Corporation

Specifications of ATxmega256A3U

• Flash (kbytes): 256 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): 16
• Eeprom (bytes): 4096
• 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

23.15.5
8331A–AVR–07/11
CTRLC – Control Register C
shift register and transmit buffer register do not contain data to be transmitted. When disabled,
the transmitter will no longer override the TxD port.
• Bit 2 – CLK2X: Double Transmission Speed
Setting this bit will reduce the divisor of the baud rate divider from16 to 8, effectively doubling the
transfer rate for asynchronous communication modes. For synchronous operation, this bit has
no effect and should always be written to zero. This bit must be zero when the USART commu-
nication mode is configured to IRCOM.
This bit is unused in master SPI mode operation.
• Bit 1 – MPCM: Multiprocessor Communication Mode
This bit enables the multiprocessor communication mode. When the MPCM bit is written to one,
the USART receiver ignores all the incoming frames that do not contain address information.
The transmitter is unaffected by the MPCM setting. For more detailed information, see
cessor Communication Mode” on page
This bit is unused in master SPI mode operation.
• Bit 0 – TXB8: Transmit Bit 8
TXB8 is the ninth data bit in the character to be transmitted when operating with serial frames
with nine data bits. When used, this bit must be written before writing the low bits to DATA.
This bit is unused in master SPI mode operation.
Note:
• Bits 7:6 – CMODE[1:0]: Communication Mode
These bits select the mode of operation of the USART as shown in
Table 23-6.
Notes:
Bit
+0x05+0x05+
0x05+0x05+0
x05+0x05
+0x05+0x05+
0x05+0x05+0
x05
Read/Write
Initial Value
(1)
CMODE[1:0]
1. Master SPI mode
1. See
2. See
00
01
10
11
mode.
operation.
CMODE bit settings.
R/W
”IRCOM - IR Communication Module” on page 312
”USART in Master SPI Mode” on page 302
7
0
CMODE[1:0]
CMODE[1:0]
Group Configuration
R/W
ASYNCHRONOUS
6
0
SYNCHRONOUS
IRCOM
MSPI
R/W
5
–
0
PMODE[1:0]
303.
R/W
Mode
Asynchronous USART
Synchronous USART
IRCOM
Master SPI
4
–
0
Atmel AVR XMEGA AU
(1)
for full description of the master
SBMODE
R/W
(2)
3
–
0
for full description on using IRCOM
UDORD
Table
R/W
2
1
23-6.
CHSIZE[2:0]
UCPHA
R/W
1
1
SPI
”Multipro-
R/W
0
–
0
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