HD6412373R RENESAS [Renesas Technology Corp], HD6412373R Datasheet - Page 442

• Manufacturer Part Number: HD6412373R
• Description: Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2300 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

Section 8 EXDMA Controller (EXDMAC)
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.
Rev.7.00 Mar. 18, 2009 page 374 of 1136
REJ09B0109-0700
Dual
address
mode
Single
address
mode
Operation
Transfer Modes
Normal
transfer
mode
Block
transfer
mode
• Direct data transfer to/from external device using EDACK
• Above transfer mode can be specified in addition to
• One transfer possible in one bus cycle
(Transfer mode variations are the same as in dual address
mode.)
pin instead of source or destination address register
address register setting
EXDMAC Transfer Modes
Transfer Mode
Auto request mode
• Burst/cycle steal
External request
mode
• Cycle steal mode
External request
mode
• Burst transfer of
• Block size: 1 to
mode
specified block size
for a single transfer
request
256 bytes or words
Auto
request
External
request
External
request
Transfer
Origin
1 to
16,777,215
or no
specification
1 to 65,535
or no
specification
Number of
Transfers
EDSAR
EDSAR/
EDACK
Source
Address Registers
EDDAR
EDACK/
EDDAR
Destination