ATxmega256A3U Atmel Corporation, ATxmega256A3U Datasheet - Page 62

• 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

8331A–AVR–07/11
• Bit 7:6 – SRCRELOAD[1:0]: DMA Channel Source Address Reload
These bits decide the DMA channel source address reload according to
these bits is ignored while the channel is busy.
Table 5-5.
• Bit 5:4 – SRCDIR[1:0]: DMA Channel Source Address Mode
These bits decide the DMA channel source address mode according to
cannot be changed if the channel is busy.
Table 5-6.
• Bit 3:2 – DESTRELOAD[1:0]: DMA Channel Destination Address Reload
These bits decide the DMA channel destination address reload according to
62. These bits cannot be changed if the channel is busy.
Table 5-7.
• Bit 1:0 – DESTDIR[1:0]: DMA Channel Destination Address Mode
These bits decide the DMA channel destination address mode according to
63. These bits cannot be changed if the channel is busy.
DESTRELOAD[1:0]
SRCRELOAD[1:0]
SRCDIR[1:0]
00
01
10
11
00
01
10
11
00
01
10
11
DMA channel source address reload settings.
DMA channel source address mode settings.
DMA channel destination address reload settings.
Group Configuration
Group Configuration
Group Configuration
TRANSACTION
TRANSACTION
BLOCK
BURST
BLOCK
BURST
FIXED
NONE
NONE
DEC
INC
-
Description
Fixed
Increment
Decrement
Reserved
Description
No reload performed.
DMA source address register is reloaded with initial
value at end of each block transfer.
DMA source address register is reloaded with initial
value at end of each burst transfer.
DMA source address register is reloaded with initial
value at end of each transaction.
Description
No reload performed.
DMA channel destination address register is reloaded
with initial value at end of each block transfer.
DMA channel destination address register is reloaded
with initial value at end of each burst transfer.
DMA channel destination address register is reloaded
with initial value at end of each transaction.
Atmel AVR XMEGA AU
Table
Table
Table 5-8 on page
Table 5-7 on page
5-6. These bits
5-5. A write to
62