HD6412332 RENESAS [Renesas Technology Corp], HD6412332 Datasheet - Page 313
HD6412332
Manufacturer Part Number
HD6412332
Description
Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2300 Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6412332.pdf
(1244 pages)
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If transfer requests are issued simultaneously for more than one channel, or if a transfer request for
another channel is issued during a transfer, when the bus is released the DMAC selects the
highest-priority channel from among those issuing a request according to the priority order shown
in table 7.13.
During burst transfer, or when one block is being transferred in block transfer, the channel will not
be changed until the end of the transfer.
Figure 7.35 shows a transfer example in which transfer requests are issued simultaneously for
channels 0A, 0B, and 1.
Address bus
DMA control
Channel 0A
Channel 0B
Channel 1
HWR
LWR
RD
φ
release
Idle
Bus
Request clear
Read
DMA read
Request
hold
Request
hold
Figure 7.35 Example of Multi-Channel Transfer
Write
Channel 0A
transfer
Selection
DMA write
selection
Non-
Idle
release
Request clear
Bus
Read
DMA read
Request
hold
Write
Channel 0B
transfer
Rev.4.00 Sep. 07, 2007 Page 283 of 1210
Selection
DMA write
Idle
release
Request clear
Bus
Read
DMA read
Channel 1 transfer
Write
REJ09B0245-0400
DMA write
Read
DMA
read
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