Rev. 1.0, 09/01, page 313 of 904
[1] Transfer source address register MAR operation (incremented/decremented/fixed)
Transfer counter ETCR operation (decremented)
Block size counter ETCR operation (decremented in block transfer mode)
[2] Transfer destination address register MAR operation (incremented/decremented/fixed)
[2']Transfer destination address register MAR operation (incremented/decremented/fixed)
Block transfer counter ETCR operation (decremented, in last transfer cycle of
a block in block transfer mode)
[3] Transfer address register MAR restore operation (in block or repeat transfer mode)
Transfer counter ETCR restore (in repeat transfer mode)
Block size counter ETCR restore (in block transfer mode)
Note: In single address transfer mode, the update timing is the same as [1].
The MAR operation is post-incrementing/decrementing of the DMA internal address value.
[3]
[2']
[2]
[1]
[1]
DMA transfer cycle
DMA read
DMA read
DMA write
DMA write
DMA
dead
DMA Internal
address
DMA control
DMA register
operation
DMA last transfer cycle
Transfer
destination
Transfer
destination
Transfer
source
Transfer
source
Idle
Idle
Idle
Read
Read
Dead
Write
Write
ø
Figure 7.39 DMAC Register Update Timing
•
If a DMAC transfer cycle occurs immediately after a DMAC register read cycle, the DMAC
register is read as shown in figure 7.40.
[2]
[1]
Note: The lower word of MAR is the updated value after the operation in [1].
CPU longword read
DMA transfer cycle
MAR upper
word read
MAR lower
word read
DMA read
DMA write
DMA internal
address
DMA control
DMA register
operation
Transfe
source
Transfer
destination
Idle
ø
Read
Write
Idle
Figure 7.40 Contention between DMAC Register Update and CPU Read
Summary of Contents for H8S/2376 F-ZTAT
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