HD6417750RF240DV Renesas Electronics America, HD6417750RF240DV Datasheet - Page 660

• Manufacturer Part Number: HD6417750RF240DV
• Description: MPU 3V 16K I-TEMP,PB-FREE 208-QF
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH7750r

Specifications of HD6417750RF240DV

• Core Processor: SH-4
• Core Size: 32-Bit
• Speed: 240MHz
• Connectivity: EBI/EMI, FIFO, SCI, SmartCard
• Peripherals: DMA, POR, WDT
• Number Of I /o: 28
• Program Memory Type: ROMless
• Ram Size: 48K x 8
• Voltage - Supply (vcc/vdd): 1.4 V ~ 1.6 V
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 208-QFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -
• Data Converters: -

Section 14 Direct Memory Access Controller (DMAC)
Figure 14.4 shows the changes in priority levels when transfer requests are issued simultaneously
for channels 0 and 3, and channel 1 receives a transfer request during a transfer on channel 0. The
operation of the DMAC in this case is as follows.
Rev.7.00 Oct. 10, 2008 Page 574 of 1074
REJ09B0366-0700
Transfer on channel 0
Transfer on channel 1
Transfer on channel 2
Transfer on channel 3
Priority after transfer due to
issuance of a transfer request
for channel 1 only.
Initial priority order
Priority order after transfer
Initial priority order
Priority order after transfer
Initial priority order
Priority order after transfer
Initial priority order
Priority order after transfer
CH0 > CH1 > CH2 > CH3
CH0 > CH1 > CH2 > CH3
CH0 > CH1 > CH2 > CH3
CH0 > CH1 > CH2 > CH3
Figure 14.3 Round Robin Mode
CH0 > CH1 > CH2 > CH3
CH1 > CH2 > CH3 > CH0
CH2 > CH3 > CH0 > CH1
CH3 > CH0 > CH1 > CH2
CH2 > CH3 > CH0 > CH1
Channel 0 is given the lowest
priority.
When channel 1 is given the
lowest priority, the priority of
channel 0, which was higher
than channel 1, is also
shifted simultaneously.
When channel 2 is given the
lowest priority, the priorities of
channels 0 and 1, which were
higher than channel 2, are
also shifted simultaneously. If
there is a transfer request for
channel 1 only immediately
afterward, channel 1 is given
the lowest priority and the
priorities of channels 3 and 0
are simultaneously shifted
down.
No change in priority order