HD6412373R RENESAS [Renesas Technology Corp], HD6412373R Datasheet - Page 478

• Manufacturer Part Number: HD6412373R
• Description: Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2300 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

Section 8 EXDMA Controller (EXDMAC)
Rev.7.00 Mar. 18, 2009 page 410 of 1136
REJ09B0109-0700
φ pin
EDREQ
EDRAK
EDREQ
acceptance
internal
processing
state
Bus cycle
EDACK
φ pin
EDREQ
EDRAK
Bus cycle
CPU
operation
EDACK
ETEND
CPU cycle
Figure 8.36 External Request/Cycle Steal Mode/Normal Transfer Mode
Figure 8.37 External Request/Cycle Steal Mode/Normal Transfer Mode
External
space
(No Contention/Single Address Mode/Falling Edge Sensing)
Bus release
Edge confirmation
Start of transfer
processing
CPU cycle CPU cycle
External
(CPU Cycles/Single Address Mode/Low Level Sensing)
space
External
space
Start of high
level sensing
EXDMA single
transfer cycle
External
EXDMA single
space
transfer cycle
Edge confirmation
Start of transfer
processing
Bus release
CPU cycle CPU cycle
2 bus cycles
EXDMA single
Start of high
level sensing
transfer cycle
External
space
Edge confirmation
Start of transfer
processing
Last transfer cycle
Bus release
External
EXDMA single
space
transfer cycle
Start of high
level sensing
EXDMA single
transfer cycle
CPU cycle