HD6417720BP133BV Renesas Electronics America, HD6417720BP133BV Datasheet - Page 491

• Manufacturer Part Number: HD6417720BP133BV
• Description: SH3-DSP, WITH USB AND LCDC, PB-F
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH7700r

Specifications of HD6417720BP133BV

• Core Processor: SH-3 DSP
• Core Size: 32-Bit
• Speed: 133MHz
• Connectivity: FIFO, I²C, IrDA, MMC, SCI, SD, SIO, SIM, USB
• Peripherals: DMA, LCD, POR, WDT
• Number Of I /o: 117
• Program Memory Type: ROMless
• Ram Size: 16K x 8
• Voltage - Supply (vcc/vdd): 1.4 V ~ 1.6 V
• Data Converters: A/D 4x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 256-BGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -

SH7720 Group, SH7721 Group
10.4.3
When the DMAC receives simultaneous transfer requests on two or more channels, it transfers
data according to a predetermined priority. Two modes (fixed mode and round-robin mode) are
selected by the PR1 and PR0 bits in DMAOR.
(1)
In this mode, the priority levels among the channels remain fixed. There are two kinds of fixed
modes as follows:
• CH0 > CH1 > CH2 > CH3 > CH4 > CH5
• CH0 > CH2 > CH3 > CH1 > CH4 > CH5
These are selected by the PR1 and the PR0 bits in DMAOR.
(2)
In round-robin mode each time data of one transfer unit (word, byte, longword, or 16-byte unit) is
transferred on one channel, the priority is rotated. The channel on which the transfer was just
finished rotates to the bottom of the priority. The round-robin mode operation is shown in figure
10.3. The priority of round-robin mode is CH0 > CH1 > CH2 > CH3 > CH4 > CH5 immediately
after a reset. When round-robin mode is specified, the same bus mode, either cycle steal mode or
burst mode, must be specified for all of the channels.
R01UH0083EJ0400 Rev. 4.00
Sep 21, 2010
Fixed Mode
Round-Robin Mode
Channel Priority
Section 10 Direct Memory Access Controller (DMAC)
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