HD64F2357F20V Datasheet, PDF (261/1049 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-chip Microcomputer H8S Family / H8S/2300 Series

DMA DMA
read single
ø
Internal address
Internal read signal
External address
RD
DACK
CPU
read
DMA
single
CPU
read
Figure 7-34 Example of Single Address Transfer Using Write Data Buffer Function
When the write data buffer function is activated, the DMAC recognizes that the bus cycle concerned has ended, and starts
the next operation. Therefore, DREQ pin sampling is started one state after the start of the DMA write cycle or single
address transfer.
7.5.13 DMAC Multi-Channel Operation
The DMAC channel priority order is: channel 0 > channel 1, and channel A > channel B. Table 7-13 summarizes the
priority order for DMAC channels.
Table 7-13 DMAC Channel Priority Order
Short Address Mode
Channel 0A
Channel 0B
Channel 1A
Channel 1B
Full Address Mode
Channel 0
Channel 1
Priority
High
Low
Rev.6.00 Oct.28.2004 page 231 of 1016
REJ09B0138-0600H