D17760BP200ADV Renesas Electronics America, D17760BP200ADV Datasheet - Page 512

• Manufacturer Part Number: D17760BP200ADV
• Description: MPU 3V 8K,PB-FREE, 256-BGA
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH7750r

Specifications of D17760BP200ADV

• Core Processor: SH-4
• Core Size: 32-Bit
• Speed: 200MHz
• Connectivity: Audio Codec, CAN, EBI/EMI, FIFO, I²C, MFI, MMC, SCI, Serial Sound, SIM, SPI, USB
• Peripherals: DMA, LCD, POR, WDT
• Number Of I /o: 69
• Program Memory Type: ROMless
• Ram Size: 48K x 8
• Voltage - Supply (vcc/vdd): 1.4 V ~ 1.6 V
• Data Converters: A/D 4x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 256-BGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -

Section 11 Direct Memory Access Controller (DMAC)
11.4.3
Channel Priorities
Receiveing simultaneous transfer requests on two or more channels, the DMAC selects a channel
according to a predetermined priority system, either in a fixed mode or round robin mode. The
mode is selected with priority bits PR1 and PR0 in DMAOR.
(1) Fixed Mode
In this mode, the relative channel priorities remain fixed. The following priority orders are
available in fixed mode:
• CH0 > CH1 > CH2 > CH3 > CH4 > CH5 > CH6 > CH7
• CH0 > CH2 > CH3 > CH4 > CH5 > CH6 > CH7 > CH1
• CH2 > CH0 > CH1 > CH3 > CH4 > CH5 > CH6 > CH7
Select one of these priority orders by setting the PR1 and PR0 bits in DMAOR.
(2) Round Robin Mode
In round robin mode, each time the transfer of one transfer unit (byte, word, longword, quadword,
or 32 bytes) ends on a given channel, that channel is assigned the lowest priority level. This is
illustrated in figure 11.4. The order of priority in round robin mode immediately after a reset is
CH0 > CH1 > CH2 > CH3 > CH4 > CH5 > CH6 > CH7. If no transfer request is accepted for any
channel during DMA transfer, the priority order becomes CH0 > CH1 > CH2 > CH3 > CH4 >
CH5 > CH6 > CH7.
Rev. 2.00 Feb. 12, 2010 Page 428 of 1330
REJ09B0554-0200