H8S-2350 RENESAS [Renesas Technology Corp], H8S-2350 Datasheet - Page 286
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H8S-2350
Manufacturer Part Number
H8S-2350
Description
16-Bit Single-Chip Microcomputer
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.H8S-2350.pdf
(1025 pages)
- Current page: 286 of 1025
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Section 7 DMA Controller (DMAC)
7.5.7
In block transfer mode, transfer is performed with channels A and B used in combination. Block
transfer mode can be specified by setting the FAE bit in DMABCR and the BLKE bit in
DMACRA to 1.
In block transfer mode, a transfer of the specified block size is carried out in response to a single
transfer request, and this is executed the specified number of times. The transfer source is
specified by MARA, and the transfer destination by MARB. Either the transfer source or the
transfer destination can be selected as a block area (an area composed of a number of bytes or
words).
Table 7.11 summarizes register functions in block transfer mode.
Table 7.11 Register Functions in Block Transfer Mode
Legend:
MARA: Memory address register A
MARB: Memory address register B
ETCRA: Transfer count register A
ETCRB: Transfer count register B
Rev. 3.00 Sep 15, 2006 page 252 of 988
REJ09B0330-0300
Register
23
23
15
Block Transfer Mode
MARA
MARB
ETCRB
7
7
ETCRAH
ETCRAL
0
0
0
0
0
Source address
register
Destination
address register
Holds block
size
Block size
counter
Block transfer
counter
Function
Initial Setting
Start address of
transfer source
Start address of
transfer destination
Block size
Block size
Number of block
transfers
Operation
Incremented/decremented
every transfer, or fixed
Incremented/decremented
every transfer, or fixed
Fixed
Decremented every
transfer; ETCRH value
copied when count
reaches H'00
Decremented every block
transfer; transfer ends
when count reaches
H'0000
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