HD6432670 Hitachi, HD6432670 Datasheet - Page 391

• Manufacturer Part Number: HD6432670
• Description: (HD64F267x Series) 16-Bit Microcomputer
• Manufacturer: Hitachi

8.4
8.4.1
The transfer modes of the EXDMAC are summarized in table 8.2.
Table 8.2
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.
Transfer Mode
Dual
address
mode
Single
address
mode
Operation
Transfer Modes
Normal
transfer
mode
Block
transfer
mode
(Transfer mode variations are the same as in dual address
mode.)
EXDMAC Transfer Modes
Direct data transfer to/from external device using
register
Above transfer mode can be specified in addition to
address register setting
One transfer possible in one bus cycle
Auto request mode
External request
mode
External request
mode
pin instead of source or destination address
Burst/cycle steal
mode
Cycle steal mode
Burst transfer of
specified block
size for a single
transfer request
Block size: 1 to
256 bytes or
words
Transfer
Origin
Auto
request
External
request
External
request
Number of
Transfers
1 to
16,777,215
or no
specification
1 to 65,535
or no
specification
Rev. 2.0, 04/02, page 345 of 906
Address Registers
Source
EDSAR
EDSAR/
Destination
EDDAR
EDDAR
/