r4f2426 Renesas Electronics Corporation., r4f2426 Datasheet - Page 464

• Manufacturer Part Number: r4f2426
• Description: 16-bit Single-chip Microcomputer H8s Family / H8s/2400 Series
• Manufacturer: Renesas Electronics Corporation.

Section 8 EXDMA Controller (EXDMAC)
After one byte or word has been transferred in response to one transfer request, the bus is released.
While the bus is released, one or more CPU, DMAC, or DTC bus cycles are initiated.
(2)
Figure 8.24 shows an example of transfer when ETEND output is enabled, and byte-size, single
address mode transfer (write) is performed from an external device to external 8-bit, 2-state access
space.
Rev. 1.00 Sep. 19, 2008 Page 436 of 1270
REJ09B0466-0100
Single Address Mode (Write)
φ
Address bus
HWR
LWR
EDACK
ETEND
Figure 8.24 Example of Single Address Mode (Byte Write) Transfer
Bus release
DMA write
Bus release
DMA write
Bus release
DMA write
Bus release
DMA write
transfer
cycle
Last
Bus release