HD6417021 Hitachi Semiconductor, HD6417021 Datasheet - Page 205

• Manufacturer Part Number: HD6417021
• Description: SuperH RISC engine
• Manufacturer: Hitachi Semiconductor

190 HITACHI
Transfer request
Figure 9.5 Example of Changes in Priority in External-Pin Round-Robin Mode
(6) Channel 0
(1) Channels
0 and 1
Waiting channel(s)
0
None
None
(2) Channel 1
(3) Channel 1
(4) Channel 0
(5) Channel 0
(7) Channel 0
(8) Channel 0
DMAC operation
transfer starts
transfer ends
transfer starts
transfer ends
transfer starts
transfer ends
does not change
Priority order
Priority order
Priority order
changes
changes
transfer request
Waiting for
Channel priority
3
3
3
3
2
2
2
2
1
0
1
1
0
1
0
0