R0K572030S000BE Renesas Electronics America, R0K572030S000BE Datasheet - Page 460

• Manufacturer Part Number: R0K572030S000BE
• Description: KIT DEV FOR SH7203
• Manufacturer: Renesas Electronics America
• Series: Renesas Starter Kits (RSK)r
• Type: MCUr

Specifications of R0K572030S000BE

• Contents: CPU Board, LCD Module, E10A-Lite Emulator, Cable, QuickStart Guide and CD-ROM
• Silicon Manufacturer: Renesas
• Kit Contents: Board
• Silicon Family Name: SH7203
• Silicon Core Number: R5S72030W200FP
• Tool / Board Applications: General Purpose MCU, MPU, DSP, DSC
• Mcu Supported Families: SH7203
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With/related Products: SH7203
• Lead Free Status / Rohs Status: Compliant

Section 10 Direct Memory Access Controller (DMAC)
10.4.3
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 10.3. 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.
Rev. 3.00 Sep. 28, 2009 Page 428 of 1650
REJ09B0313-0300
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