r5s72060w200fpv Renesas Electronics Corporation., r5s72060w200fpv Datasheet - Page 415
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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9.4.3
When the DMAC receives simultaneous transfer requests on two or more channels, it selects a
channel according to a predetermined priority order. Three modes (fixed mode 1, fixed mode 2,
and round-robin mode) are selected using the PR1 and PR0 bits in DMAOR.
(1)
In fixed modes, the priority levels among the channels remain fixed. There are two kinds of fixed
modes as follows:
These are selected by the PR1 and PR0 bits in the DMA operation register (DMAOR).
(2)
Each time one unit of word, byte, longword, or 16 bytes is transferred on one channel, the priority
order is rotated. The channel on which the transfer was just finished is rotated to the lowest of the
priority order among the four round-robin channels (channels 0 to 4). The priority of the channels
other than the round-robin channels (channels 0 to 4) does not change even in round-robin mode.
The round-robin mode operation is shown in figure 9.3. The priority in round-robin mode is CH0
> CH1 > CH2 > CH3 > CH4 > CH5 > CH6 > CH7 immediately after a reset.
When the round-robin mode has been specified, do not concurrently specify cycle steal mode and
burst mode as the bus modes of any two or more channels.
Fixed Mode
Round-Robin Mode
Channel Priority
Fixed mode 1: CH0 > CH1 > CH2 > CH3 > CH4 > CH5 > CH6 > CH7
Fixed mode 2: CH0 > CH4 > CH1 > CH5 > CH2 > CH6 > CH3 > CH7
Section 9 Direct Memory Access Controller (DMAC)
Rev. 2.00 Dec. 09, 2005 Page 391 of 1152
REJ09B0191-0200
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