H8S2368 Datasheet, PDF (310/1037 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2300 Series

Section 7 DMA Controller (DMAC)
7.5.5 Single Address Mode
Single address mode can only be specified for channel B. This mode can be specified by setting
the SAE bit in DMABCRH to 1 in short address mode.
One address is specified by MAR, and the other is set automatically to the data transfer
acknowledge pin (DACK). The transfer direction can be specified by the DTDIR bit in DMACR.
Table 7.8 summarizes register functions in single address mode.
Table 7.8 Register Functions in Single Address Mode
Function
Register
DTDIR = 0 DTDIR = 1 Initial Setting
Operation
23
0 _{Source Destination Start address of See sections 7.5.2,}
MAR
address address transfer destination Sequential Mode,
register register or transfer source 7.5.3, Idle Mode,
and 7.5.4, Repeat
Mode.
DACK pin
Write
strobe
Read
strobe
(Set automatically Strobe for external
by SAE bit; IOAR is device
invalid)
15
0
ETCR
Transfer counter
Number of transfers See sections 7.5.2,
Sequential Mode,
7.5.3, Idle Mode,
and 7.5.4, Repeat
Mode.
MAR specifies the start address of the transfer source or transfer destination as 24 bits. IOAR is
invalid; in its place the strobe for external devices (DACK) is output.
Figure 7.9 illustrates operation in single address mode (when sequential mode is specified).
Rev. 5.00 Aug 02, 2006 page 256 of 980
REJ09B0050-0500