AT32UC3A3128 Atmel Corporation, AT32UC3A3128 Datasheet - Page 319

• Manufacturer Part Number: AT32UC3A3128
• Manufacturer: Atmel Corporation

Specifications of AT32UC3A3128

• Flash (kbytes): 128 Kbytes
• Pin Count: 144
• Max. Operating Frequency: 66 MHz
• Cpu: 32-bit AVR
• # Of Touch Channels: 32
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 110
• Ext Interrupts: 110
• Usb Transceiver: 1
• Usb Speed: Hi-Speed
• Usb Interface: Device + OTG
• Spi: 6
• Twi (i2c): 2
• Uart: 4
• Lin: 4
• Ssc: 1
• Sd / Emmc: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 384
• Resistive Touch Screen: No
• Dac Channels: 2
• Dac Resolution (bits): 16
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 128
• Self Program Memory: YES
• External Bus Interface: 1
• Dram Memory: sdram
• Nand Interface: Yes
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 3.0 to 3.6
• Operating Voltage (vcc): 3.0 to 3.6
• Fpu: No
• Mpu / Mmu: Yes / No
• Timers: 6
• Output Compare Channels: 18
• Input Capture Channels: 12
• Pwm Channels: 12
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

32072G–11/2011
DMA transfer: Software controls the number of blocks in a DMACA transfer. Once the DMA
transfer has completed, then hardware within the DMACA disables the channel and can gener-
ate an interrupt to signal the completion of the DMA transfer. You can then re-program the
channel for a new DMA transfer.
Single-block DMA transfer: Consists of a single block.
Multi-block DMA transfer: A DMA transfer may consist of multiple DMACA blocks. Multi-block
DMA transfers are supported through block chaining (linked list pointers), auto-reloading of
channel registers, and contiguous blocks. The source and destination can independently select
which method to use.
Scatter: Relevant to destination transfers within a block. The destination System Bus address is
incremented or decremented by a programmed amount -the scatter increment- when a scatter
boundary is reached. The destination System Bus address is incremented or decremented by
the value stored in the destination scatter increment (DSRx.DSI) field, multiplied by the number
of bytes in a single HSB transfer to the destination (decoded value of CTLx.DST_TR_WIDTH)/8.
The number of destination transfers between successive scatter boundaries is programmed into
the Destination Scatter Count (DSC) field of the DSRx register.
Scatter is enabled by writing a ‘1’ to the CTLx.DST_SCATTER_EN bit. The CTLx.DINC field
determines if the address is incremented, decremented or remains fixed when a scatter bound-
ary is reached. If the CTLx.DINC field indicates a fixed-address control throughout a DMA
transfer, then the CTLx.DST_SCATTER_EN bit is ignored, and the scatter feature is automati-
cally disabled.
Gather: Relevant to source transfers within a block. The source System Bus address is incre-
mented or decremented by a programmed amount when a gather boundary is reached. The
number of System Bus transfers between successive gather boundaries is programmed into the
Source Gather Count (SGRx.SGC) field. The source address is incremented or decremented by
the value stored in the source gather increment (SGRx.SGI) field multiplied by the number of
bytes in a single HSB transfer from the source -(decoded value of CTLx.SRC_TR_WIDTH)/8 -
when a gather boundary is reached.
– Single transaction: The length of a single transaction is always 1 and is converted
– Burst transaction: The length of a burst transaction is programmed into the
– Linked lists (block chaining) – A linked list pointer (LLP) points to the location in
– Auto-reloading – The DMACA automatically reloads the channel registers at the
– Contiguous blocks – Where the address between successive blocks is selected to
to a single System Bus transfer.
DMACA. The burst transaction is converted into a sequence of System Bus bursts
and single transfers. DMACA executes each burst transfer by performing
incremental bursts that are no longer than the maximum System Bus burst size set.
The burst transaction length is under program control and normally bears some
relationship to the FIFO sizes in the DMACA and in the source and destination
peripherals.
system memory where the next linked list item (LLI) exists. The LLI is a set of
registers that describe the next block (block descriptor) and an LLP register. The
DMACA fetches the LLI at the beginning of every block when block chaining is
enabled.
end of each block to the value when the channel was first enabled.
be a continuation from the end of the previous block.
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