HD6417727F160V Renesas Electronics America, HD6417727F160V Datasheet - Page 462

• Manufacturer Part Number: HD6417727F160V
• Description: MPU 3V 16K PB-FREE 240-QFP
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH7700r

Specifications of HD6417727F160V

• Core Processor: SH-3 DSP
• Core Size: 32-Bit
• Speed: 160MHz
• Connectivity: FIFO, SCI, SIO, SmartCard, USB
• Peripherals: DMA, LCD, POR, WDT
• Number Of I /o: 104
• Program Memory Type: ROMless
• Ram Size: 32K x 8
• Voltage - Supply (vcc/vdd): 1.7 V ~ 2.05 V
• Data Converters: A/D 6x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 240-QFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -

Section 14 Direct Memory Access Controller (DMAC)
Figure 14.4 shows how the priority order changes when transfer requests for channel 0 and
channel 3 are generated simultaneously and a transfer request for channel 1 is requested during the
channel 0 transfer. The DMAC operates as follows:
1. Transfer requests are generated simultaneously for channels 0 and 3.
2. Channel 0 has the higher priority, so the channel 0 transfer begins first (channel 3 waits for
3. A channel 1 transfer request occurs during the channel 0 transfer (channels 1 and 3 are both
4. When the channel 0 transfer ends, channel 0 has the lowest priority.
5. At this time, channel 1 has the higher priority than channel 3, so the channel 1 transfer begins
6. When the channel 1 transfer ends, channel 1 has the lowest priority.
7. The channel 3 transfer begins.
8. When the channel 3 transfer ends, channels 3 and 2 shift downward in priority order so that
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transfer).
waiting)
(channel 3 waits for transfer).
channel 3 has the lowest priority.
Transfer request
(1) Channels 0 and 3
(3) Channel 1
Figure 14.4 Channel Priority Order in Round-Robin Mode
Waiting channel(s) DMAC operation
1,3
3
3
None
(2) Channel 0 transfer
(4) Channel 0 transfer
(5) Channel 1 transfer
(6) Channel 1 transfer
(7) Channel 3 transfer
(8) Channel 3 transfer
start
ends
starts
ends
starts
ends
Priority order
changes
Priority order
changes
Priority order
changes
Channel priority
0 > 1 > 2 > 3
1 > 2 > 3 > 0
2 > 3 > 0 > 1
0 > 1 > 2 > 3