ATXMEGA256A3B_09 ATMEL [ATMEL Corporation], ATXMEGA256A3B_09 Datasheet - Page 15
ATXMEGA256A3B_09
Manufacturer Part Number
ATXMEGA256A3B_09
Description
8/16-bit XMEGA A3B Microcontroller
Manufacturer
ATMEL [ATMEL Corporation]
Datasheet
1.ATXMEGA256A3B_09.pdf
(102 pages)
- Current page: 15 of 102
- Download datasheet (4Mb)
8. DMAC - Direct Memory Access Controller
8.1
8.2
8116F–AVR–09/09
Features
Overview
•
•
•
•
•
•
The XMEGA A3B has a Direct Memory Access (DMA) Controller to move data between memo-
ries and peripherals in the data space. The DMA controller uses the same data bus as the CPU
to transfer data.
It has 4 channels that can be configured independently. Each DMA channel can perform data
transfers in blocks of configurable size from 1 to 64K bytes. A repeat counter can be used to
repeat each block transfer for single transactions up to 16M bytes. Each DMA channel can be
configured to access the source and destination memory address with incrementing, decrement-
ing or static addressing. The addressing is independent for source and destination address.
When the transaction is complete the original source and destination address can automatically
be reloaded to be ready for the next transaction.
The DMAC can access all the peripherals through their I/O memory registers, and the DMA may
be used for automatic transfer of data to/from communication modules, as well as automatic
data retrieval from ADC conversions, data transfer to DAC conversions, or data transfer to or
from port pins. A wide range of transfer triggers are available from the peripherals, Event System
and software. Each DMA channel has different transfer triggers.
To allow for continuous transfers, two channels can be interlinked so that the second takes over
the transfer when the first is finished and vice versa.
The DMA controller can read from memory mapped EEPROM, but it cannot write to the
EEPROM or access the Flash.
Allows High-speed data transfer
4 Channels
From 1 byte and up to 16M bytes transfers in a single transaction
Multiple addressing modes for source and destination address
1, 2, 4, or 8 byte Burst Transfers
Programmable priority between channels
– From memory to peripheral
– From memory to memory
– From peripheral to memory
– From peripheral to peripheral
– Increment
– Decrement
– Static
XMEGA A3B
15
Related parts for ATXMEGA256A3B_09
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
Part Number:
Description:
Atmel CryptoMemory
Manufacturer:
ATMEL [ATMEL Corporation]
Datasheet:
Part Number:
Description:
Atmel CryptoMemory
Manufacturer:
ATMEL [ATMEL Corporation]
Datasheet:
Part Number:
Description:
Atmel CryptoMemory, 16Kbit
Manufacturer:
ATMEL [ATMEL Corporation]
Datasheet:
Part Number:
Description:
8-bit Atmel Microcontrollers
Manufacturer:
ATMEL [ATMEL Corporation]
Datasheet:
Part Number:
Description:
8-bit Atmel Microcontroller with 64K/128K/256K Bytes In-System Programmable Flash
Manufacturer:
ATMEL [ATMEL Corporation]
Datasheet:
Part Number:
Description:
8-bit Atmel Microcontroller with 16/32/64/128K Bytes In-System Programmable Flash
Manufacturer:
ATMEL [ATMEL Corporation]
Datasheet:
Part Number:
Description:
8-bit Atmel Microcontroller with 16/32/64K Bytes In-System Programmable Programmable
Manufacturer:
ATMEL [ATMEL Corporation]
Datasheet:
Part Number:
Description:
INTERVAL AND WIPE/WASH WIPER CONTROL IC WITH DELAY
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
Low-Voltage Voice-Switched IC for Hands-Free Operation
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
MONOLITHIC INTEGRATED FEATUREPHONE CIRCUIT
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
AM-FM Receiver IC U4255BM-M
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
Monolithic Integrated Feature Phone Circuit
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
Multistandard Video-IF and Quasi Parallel Sound Processing
Manufacturer:
ATMEL Corporation
Datasheet: