r5s72060w200fpv Renesas Electronics Corporation., r5s72060w200fpv Datasheet - Page 424
r5s72060w200fpv
Manufacturer Part Number
r5s72060w200fpv
Description
32-bit Risc Microcomputer Superhtm Risc Engine Family / Sh7200 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.R5S72060W200FPV.pdf
(1180 pages)
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Section 9 Direct Memory Access Controller (DMAC)
(b) Burst Mode
In burst mode, once the DMAC obtains the bus mastership, it does not release the bus mastership
and continues to perform transfer until the transfer end condition is satisfied. In external request
mode with low level detection of the DREQ pin, however, when the DREQ pin is driven high, the
bus mastership is passed to another bus master after the DMAC transfer request that has already
been accepted ends, even if the transfer end conditions have not been satisfied.
Figure 9.11 shows DMA transfer timing in burst mode.
DREQ
Bus cycle
CPU
CPU
CPU
DMAC DMAC DMAC DMAC
CPU
CPU
Read
Write
Read
Write
Figure 9.11 DMA Transfer Example in Burst Mode
(Dual Address, DREQ Low Level Detection)
(3)
Relationship between Request Modes and Bus Modes by DMA Transfer Category
Table 9.10 shows the relationship between request modes and bus modes by DMA transfer
category.
Rev. 2.00 Dec. 09, 2005 Page 400 of 1152
REJ09B0191-0200
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