HD6412350 Hitachi, HD6412350 Datasheet - Page 260

• Manufacturer Part Number: HD6412350
• Description: (HD6412350 / HD6432351) 16-BIT MICROCONTROLLER
• Manufacturer: Hitachi

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 in DMACR.
Table 7-9 summarizes register functions in single address mode.
Table 7-9
Register
DACK pin
Legend
MAR
IOAR : I/O address register
ETCR : Transfer count 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.
240
23
: Memory address register
7.5.4, Repeat Mode.
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
Function
Destination
address
register
Read
strobe
Start address of
transfer destination
or transfer source
(Set automatically
by SAE bit; IOAR is
invalid)
Number of transfers *
*
Strobe for external
device
Operation