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H8/3003 Datasheet(PDF) 205 Page - Renesas Technology Corp

Part # H8/3003
Description  microcontroller (MCU)
PDF  715 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

H8/3003 Datasheet(HTML) 205 Page - Renesas Technology Corp

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8.3 Register Descriptions (2) (Full Address Mode)
In full address mode the A and B channels operate together. Full address mode is selected as
indicated in table 8-4.
8.3.1 Memory Address Registers (MAR)
A memory address register (MAR) is a 32-bit readable/writable register. MARA functions as the
source address register of the transfer, and MARB as the destination address register.
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.
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 8.3.4,
Data Transfer Control Registers (DTCR).
The MARs are not initialized by a reset or in standby mode.
8.3.2 I/O Address Registers (IOAR)
The I/O address registers (IOARs) are not used in full address mode.
Bit
Initial value
Read/Write
31
1
—
Source or destination address
30
1
—
29
1
—
28
1
—
27
1
—
26
1
—
25
1
—
24
1
—
23
R/W
22
R/W
21
R/W
20
R/W
19
R/W
18
R/W
17
R/W
16
R/W
15
R/W
14
R/W
13
R/W
12
R/W
11
Undetermined
R/W
10
R/W
9
R/W
8
R/W
7
R/W
6
R/W
5
R/W
4
R/W
3
R/W
2
R/W
1
R/W
0
R/W
MARR
MARE
MARH
MARL
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