r4f2456 Renesas Electronics Corporation., r4f2456 Datasheet - Page 372
r4f2456
Manufacturer Part Number
r4f2456
Description
16-bit Single-chip Microcomputer H8s Family / H8s/2400 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.R4F2456.pdf
(1376 pages)
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Section 7 DMA Controller (DMAC)
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 7.5 summarizes register functions in sequential mode.
Table 7.5
MAR specifies the start address of the transfer source or transfer destination as 24 bits. MAR is
incremented or decremented by 1 or 2 each time a byte or word is transferred. IOAR specifies the
lower 16 bits of the other address. The 8 bits above IOAR have a value of H'FF.
Figure 7.3 illustrates operation in sequential mode.
Rev. 1.00 Sep. 19, 2008 Page 342 of 1342
REJ09B0467-0100
Register
23
23
H'FF
15
Sequential Mode
15
Register Functions in Sequential Mode
ETCR
MAR
IOAR
0
0
0
Source
address
register
Destination
address
register
Transfer counter
DTDIR = 0 DTDIR = 1 Initial Setting
Function
Destination
address
register
Source
address
register
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
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