r4f2456 Renesas Electronics Corporation., r4f2456 Datasheet - Page 471

• Manufacturer Part Number: r4f2456
• Description: 16-bit Single-chip Microcomputer H8s Family / H8s/2400 Series
• Manufacturer: Renesas Electronics Corporation.

φ pin
Bus cycle
Current
channel
EDACK
Other
channel
transfer
request
(EDREQ)
φ pin
Bus cycle
CPU
operation
EDACK
ETEND
single cycle
CPU cycle
EXDMA
Figure 8.29 Auto Request/Cycle Steal Mode/Normal Transfer Mode
Figure 8.30 Auto Request/Cycle Steal Mode/Normal Transfer Mode
External
space
1 cycle
Bus
release
(Contention with Another Channel/Single Address Mode)
EXDMA single
single cycle
transfer cycle
EXDMA
External space
(CPU Cycles/Single Address Mode)
Bus
release
single cycle
1 bus cycle
CPU cycle
EXDMA
1 cycle
Bus
release
EXDMA single
transfer cycle
Higher-priority channel EXDMA cycle
External space
Rev. 1.00 Sep. 19, 2008 Page 441 of 1342
Section 8 EXDMA Controller (EXDMAC)
CPU cycle
Last transfer cycle
EXDMA single
transfer cycle
1 cycle
External space
Bus
release
REJ09B0467-0100
single cycle
EXDMA
CPU cycle
Bus
release