
Rev. 2.0, 09/02, page 176 of 732
Relationship between Request Modes and Bus Modes by DMA Transfer Category
Table 10.5 shows the relationship between request modes and bus modes by DMA transfer
category.
Table 10.5 Relationship of Request Modes and Bus Modes by DMA Transfer Category
Address
Mode
Single
Transfer Category
External device with DACK and
external memory
External device with DACK and
memory-mapped external device
External memory and external memory
External memory and memory-mapped
external device
Memory-mapped external device and
memory-mapped external device
External memory and on-chip memory
External memory and on-chip
peripheral module
Memory-mapped external device and
on-chip memory
Memory-mapped external device and
on-chip peripheral module
On-chip memory and on-chip memory
On-chip memory and on-chip
peripheral module
On-chip peripheral module and on-
chip peripheral module
Request
Mode
External
Bus
Mode
B/C
Transfer
Size (Bits)
8/16/32
Usable
Channels
0, 1
External
B/C
8/16/32
0, 1
Dual
Any
*
Any
*
1
B/C
B/C
8/16/32
8/16/32
0 to 3
*
0 to 3
*
5
1
5
Any
*
1
B/C
8/16/32
0 to 3
*
5
Any
*
Any
*
1
B/C
B/C
*
8/16/32
8/16/32
*
0 to 3
*
0 to 3
*
5
2
3
4
5
Any
*
1
B/C
8/16/32
0 to 3
*
5
Any
*
2
B/C
*
3
8/16/32
*
4
0 to 3
*
5
Any
*
Any
*
1
B/C
B/C
*
8/16/32
8/16/32
*
0 to 3
*
0 to 3
*
5
2
3
4
5
Any
*
2
B/C
*
3
8/16/32
*
4
0 to 3
*
5
B: Burst
C: Cycle steal
Notes: 1. External request, auto-request or on-chip peripheral module request enabled. However,
in the case of on-chip peripheral module request, it is not possible to specify the SCI or
A/D converter for the transfer request source.
2. External request, auto-request or on-chip peripheral module request possible. However,
if transfer request source is also the SCI or A/D converter, the transfer source or
transfer destination must be the SCI or A/D converter.
3. When the transfer request source is the SCI, only cycle steal mode is possible.
4. Access size permitted by register of on-chip peripheral module that is the transfer
source or transfer destination.
5. When the transfer request is an external request, channels 0 and 1 only can be used.