HD6417660 RENESAS [Renesas Technology Corp], HD6417660 Datasheet - Page 358

• Manufacturer Part Number: HD6417660
• Description: Renesas 32-Bit RISC Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

5. At this point, channel 1 has a higher priority than channel 3, so the channel 1 transfer begins
6. When the channel 1 transfer ends, channel 1 becomes lowest priority.
7. The channel 3 transfer begins.
8. When the channel 3 transfer ends, channels 3 and 2 shift downward in priority so that channel
Rev. 1.00, 02/04, page 320 of 804
(channel 3 waits for transfer).
3 becomes the lowest priority.
Figure 10.4 Changes in Channel Priority in Round-Robin Mode
Transfer request
(1) Channels 0 and 3
(3) Channel 1
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