HD6413003RVF RENESAS [Renesas Technology Corp], HD6413003RVF Datasheet - Page 198
HD6413003RVF
Manufacturer Part Number
HD6413003RVF
Description
microcontroller (MCU)
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6413003RVF.pdf
(715 pages)
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8.2.1 Memory Address Registers (MAR)
A memory address register (MAR) is a 32-bit readable/writable register that specifies a source or
destination address. The transfer direction is determined automatically from the activation source.
An MAR consists of four 8-bit registers designated MARR, MARE, MARH, and MARL. All bits
of MARR are reserved: they cannot be modified and always read 1.
An MAR functions as a source or destination address register depending on how the DMAC is
activated: as a destination address register if activation is by a receive-data-full interrupt from the
serial communication interface (SCI), and as a source address register otherwise.
The MAR value is incremented or decremented each time one byte or word is transferred,
automatically updating the source or destination memory address. For details, see section 8.2.4,
Data Transfer Control Registers (DTCR).
The MARs are not initialized by a reset or in standby mode.
Bit
Initial value
Read/Write
31
—
30
—
29
—
MARR
28
—
27
—
26
—
25
—
24
—
R/W
23
R/W
22
R/W
21
R/W
MARE
20
Source or destination address
R/W
19
R/W
18
180
R/W
17
Undetermined
R/W
16
R/W
15
R/W
14
R/W
13
R/W
MARH
12
R/W
11
R/W
10
R/W
9
R/W
8
R/W
7
R/W
6
R/W
5
R/W
MARL
4
R/W
3
R/W
2
R/W
1
R/W
0
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