Rev. 1.0, 09/01, page 281 of 904
One address is specified by MAR, and the other is set automatically to the data transfer
acknowledge pin (
'$&.
). The transfer direction can be specified by the DTDIR bit in DMACR.
Table 7.8 summarizes register functions in single address mode.
Table 7.8
Register Functions in Single Address Mode
Function
Register
DTDIR = 0 DTDIR = 1 Initial Setting
Operation
23
0
MAR
Source
address
register
Destination
address
register
Start address of
transfer destination
or transfer source
See sections 7.5.2,
Sequential Mode,
7.5.3, Idle Mode,
and 7.5.4, Repeat
Mode.
'$&.
pin
Write
strobe
Read
strobe
(Set automatically
by SAE bit; IOAR is
invalid)
Strobe for external
device
0
15
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 (
'$&.
) is output.
Figure 7.9 illustrates operation in single address mode (when sequential mode is specified).
Содержание H8S/2376 F-ZTAT
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