mcf51jf128 Freescale Semiconductor, Inc, mcf51jf128 Datasheet - Page 417

• Manufacturer Part Number: mcf51jf128
• Description: Mcf51jf128 Reference Manual
• Manufacturer: Freescale Semiconductor, Inc

Freescale Semiconductor, Inc.
Reserved
DMAC1
CFSM1
22–20
19–16
Field
23
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
Clear state machine control 1
This bit clears the state machine for DMA channel 1. When changing the DMAC1 field to select a different
requester, set (write 1) to the CFSM1 bit to clear the channel's state machine. Writing 0 to this bit has no
effect. The bit always reads as 0.
0
1
This read-only bitfield is reserved and always has the value zero.
DMA channel 1
This four-bit field defines the logical connection between the DMA requesters and DMA channel 1. There
are sixteen possible requesters per channel and any request from the possible sources can be routed to
the DMA channel 1. Effectively, the DMAREQC register provides a software-controlled routing matrix of
the DMA request signals to the 4 channels of the DMA module. DMAC1 controls DMA channel 1.
The DMA also uses this register to control the broadcasting of acknowledge/done signals back to the
selected peripheral to complete the hardware-initiated data transfer.
The definition of the 16 possible DMA request sources for each channel is device specific. Refer to the
Chip Configuration details for more information.
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
No effect
Clear state machine for DMA channel 1
Select request 5 as the source
Select request 6 as the source
Select request 7 as the source
Select request 8 as the source
Select request 9 as the source
Select request 10 as the source
Select request 11 as the source
Select request 12 as the source
Select request 13 as the source
Select request 14 as the source
Select request 15 as the source
Select request 0 as the source
Select request 1 as the source
Select request 2 as the source
Select request 3 as the source
Select request 4 as the source
Select request 5 as the source
Select request 6 as the source
Select request 7 as the source
Select request 8 as the source
Select request 9 as the source
Select request 10 as the source
Select request 11 as the source
Select request 12 as the source
Select request 13 as the source
Select request 14 as the source
Select request 15 as the source
DMA_REQC field descriptions (continued)
MCF51JF128 Reference Manual, Rev. 2, 03/2011
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Preliminary
Description
Chapter 19 DMA Controller
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