HD6412320 RENESAS [Renesas Technology Corp], HD6412320 Datasheet - Page 287
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HD6412320
Manufacturer Part Number
HD6412320
Description
Renesas 16-Bit Single-Chip Microcomputer H8S Family H8S-2300 Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6412320.pdf
(1302 pages)
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Block Transfer Mode: In response to a single transfer request, a block transfer of the specified
block size is carried out. This is repeated the specified number of times, once each time there is a
transfer request. At the end of each single block transfer, one address is restored to its original
setting. An interrupt request can be sent to the CPU or DTC when the specified number of block
transfers have been completed. Both addresses are specified as 24 bits.
7.5.2
Sequential mode can be specified by clearing the RPE bit in DMACR to 0. In sequential mode,
MAR is updated after each byte or word transfer in response to a single transfer request, and this is
executed the number of times specified in ETCR.
One address is specified by MAR, and the other by IOAR. The transfer direction can be specified
by the DTDIR bit in DMACR.
Table 7.6 summarizes register functions in sequential mode.
Table 7.6
Register
23
23
Legend:
MAR:
IOAR:
ETCR: Execute transfer count register
DTDIR: Data transfer direction bit
In response to a single transfer request, the specified number of transfers are carried out, one
byte or one word at a time. An interrupt request can be sent to the CPU or DTC when the
specified number of transfers have been completed. Both addresses are specified as 24 bits.
H'FF
Memory address register
I/O address register
15
15
Sequential Mode
MAR
Register Functions in Sequential Mode
IOAR
ETCR
0
0
0
DTDIR = 0 DTDIR = 1 Initial Setting
Source
address
register
Destination
address
register
Transfer counter
Section 7 DMA Controller (Not Supported in the H8S/2321)
Function
Destination
address
register
Source
address
register
Rev.6.00 Sep. 27, 2007 Page 257 of 1268
Start address of
transfer destination
or transfer source
Start address of
transfer source or
transfer destination
Number of transfers Decremented every
Operation
Incremented/
decremented every
transfer
Fixed
transfer; transfer
ends when count
reaches H'0000
REJ09B0220-0600
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