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參數(shù)資料
| 型號： | MPG5374X |
| 元件分類： | LED |
| 英文描述： | T-1 3/4 SINGLE COLOR LED, GREEN, 5 mm |
| 封裝： | ROHS COMPLIANT PACKAGE-2 |
| 文件頁數(shù)： | 8/32頁 |
| 文件大?。?/td> | 413K |
| 代理商： | MPG5374X |
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16
XMEGA C3 [DATASHEET]
8361D–AVR–07/2013
8.
DMAC – Direct Memory Access Controller
8.1
Features
Allows high speed data transfers with minimal CPU intervention
– from data memory to data memory
– from data memory to peripheral
– from peripheral to data memory
– from peripheral to peripheral
Two DMA channels with separate
– transfer triggers
– interrupt vectors
– addressing modes
Programmable channel priority
From 1 byte to 16MB of data in a single transaction
– Up to 64KB block transfers with repeat
– 1, 2, 4, or 8 byte burst transfers
Multiple addressing modes
– Static
– Incremental
– Decremental
Optional reload of source and destination addresses at the end of each
– Burst
– Block
– Transaction
Optional interrupt on end of transaction
Optional connection to CRC generator for CRC on DMA data
8.2
Overview
The two-channel direct memory access (DMA) controller can transfer data between memories and peripherals, and thus
offload these tasks from the CPU. It enables high data transfer rates with minimum CPU intervention, and frees up CPU
time. The four DMA channels enable up to four independent and parallel transfers.
The DMA controller can move data between SRAM and peripherals, between SRAM locations and directly between
peripheral registers. With access to all peripherals, the DMA controller can handle automatic transfer of data to/from
communication modules. The DMA controller can also read from memory mapped EEPROM.
Data transfers are done in continuous bursts of 1, 2, 4, or 8 bytes. They build block transfers of configurable size from 1
byte to 64KB. A repeat counter can be used to repeat each block transfer for single transactions up to 16MB. Source and
destination addressing can be static, incremental or decremental. Automatic reload of source and/or destination
addresses can be done after each burst or block transfer, or when a transaction is complete. Application software,
peripherals, and events can trigger DMA transfers.
The two DMA channels have individual configuration and control settings. This include source, destination, transfer
triggers, and transaction sizes. They have individual interrupt settings. Interrupt requests can be generated when a
transaction is complete or when the DMA controller detects an error on a DMA channel.
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.
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