mcf5272 Freescale Semiconductor, Inc, mcf5272 Datasheet - Page 220

• Manufacturer Part Number: mcf5272
• Description: Mcf5272 Coldfire Integrated Microprocessor User
• Manufacturer: Freescale Semiconductor, Inc

DMA Address Modes
10.2 DMA Address Modes
The DMA address mode determines how the address output by the channel is updated after
a transfer to be ready for the next transfer. The two following modes are supported:
10.3 DMA Controller Registers
The MCF5272 DMA controller supports a single DMA channel which can be used for
memory-to-memory transfers.
10.3.1 DMA Mode Register (DMR)
The DMR controls various operation modes, principally the request and addressing modes.
Fields include the transfer size and modifier, transfer direction, channel enable and reset.
Table 10-2 describes DMR fields.
10-2
Reset
Reset
Field RESET
Field
Addr
R/W
R/W
• Static address mode—The address remains unchanged after the transfer completes.
• Increment address mode—In increment address mode, the address is incremented at
This mode should be used when the source or destination address is the FIFO data
port of an on-chip peripheral.
the end of the transfer by the number of bytes transferred. This mode should be used
when a source or destination address is in external memory.
—
31
15
0
14
EN
30
DSTM
01
29
13
Figure 10-1. DMA Mode Register (DMR)
12
DSTT
1_00
10
MCF5272 User’s Manual
9
DSTS
0000_0000_0000_0000
01
MBAR + 0x00E0
—
8
R/W
R/W
—
0
7
—
0
6
SRCM
1
5
4
20 19
SRCT
1_01
RQM
18 17
2 1
MOTOROLA
SRCS
01
—
16
0