Rev. 1.0, 09/01, page 331 of 904
8.4
Operation
8.4.1
Transfer Modes
The transfer modes of the EXDMAC are summarized in table 8.2.
Table 8.2
EXDMAC Transfer Modes
Address Registers
Transfer Mode
Transfer
Origin
Number of
Transfers
Source
Destination
Dual
address
mode
Normal
transfer
mode
Auto request mode
•
Burst/cycle steal
mode
Auto
request
1 to
16,777,215
or no
specification
EDSAR
EDDAR
External request
mode
•
Cycle steal mode
External
request
Block
transfer
mode
External request
mode
•
Burst transfer of
specified block
size for a single
transfer request
•
Block size: 1 to
256 bytes or
words
External
request
1 to 65,535
or no
specification
Single
address
mode
•
Direct data transfer to/from external device using
('$&.
pin instead of source or destination address
register
•
Above transfer mode can be specified in addition to
address register setting
•
One transfer possible in one bus cycle
(Transfer mode variations are the same as in dual address
mode.)
EDSAR/
('$&.
('$&.
/
EDDAR
The transfer mode can be set independently for each channel.
In normal transfer mode, a one-byte or one-word transfer is executed in response to one transfer
request. With auto requests, burst or cycle steal transfer mode can be set. In burst transfer mode,
continuous, high-speed transfer can be performed until the specified number of transfers have
been executed or the transfer enable bit is cleared to 0.
Содержание H8S/2376 F-ZTAT
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