HD6412320 RENESAS [Renesas Technology Corp], HD6412320 Datasheet - Page 297

• Manufacturer Part Number: HD6412320
• Description: Renesas 16-Bit Single-Chip Microcomputer H8S Family H8S-2300 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

7.5.5
Single address mode can only be specified for channel B. This mode can be specified by setting
the SAE bit in DMABCR 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 7.9 summarizes register functions in single address mode.
Table 7.9
Register
23
DACK pin
Legend:
MAR:
IOAR: I/O address register
ETCR: Execute transfer register
DTDIR: Data transfer direction bit
DACK: Data transfer acknowledge
Note: * See the operation descriptions in sections 7.5.2, Sequential Mode, 7.5.3, Idle Mode, and
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.
7.5.4, Repeat Mode.
Memory address register
15
Single Address Mode
MAR
Register Functions in Single Address Mode
ETCR
0
0
DTDIR = 0 DTDIR = 1 Initial Setting
Source
address
register
Write
strobe
Transfer counter
Section 7 DMA Controller (Not Supported in the H8S/2321)
Function
Destination
address
register
Read
strobe
Rev.6.00 Sep. 27, 2007 Page 267 of 1268
Start address of
transfer destination
or transfer source
(Set automatically
by SAE bit; IOAR is
invalid)
Number of transfers *
Operation
*
Strobe for external
device
REJ09B0220-0600