HD6413008F RENESAS [Renesas Technology Corp], HD6413008F Datasheet - Page 148
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HD6413008F
Manufacturer Part Number
HD6413008F
Description
Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6413008F.pdf
(686 pages)
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6. Bus Controller
6.1.4
Table 6.2 summarizes the bus controller's registers.
Table 6.2
Address*
H'EE020
H'EE021
H'EE022
H'EE023
H'EE013
H'EE01F
H'EE01E
H'EE024
Notes: 1. Lower 20 bits of the address in advanced mode.
6.2
6.2.1
ABWCR is an 8-bit readable/writable register that selects 8-bit or 16-bit access for each area.
Bit
When ABWCR contains H'FF (selecting 8-bit access for all areas), the chip operates in 8-bit bus
mode: the upper data bus (D
bit is cleared to 0 in ABWCR, the chip operates in 16-bit bus mode with a 16-bit data bus (D
D
modes 2 and 4, ABWCR is initialized to H'00 by a reset and in hardware standby mode. It is not
initialized in software standby mode.
Rev.4.00 Aug. 20, 2007 Page 104 of 638
REJ09B0395-0400
Modes
1 and 3
Modes
2 and 4
0
). In modes 1 and 3, ABWCR is initialized to H'FF by a reset and in hardware standby mode. In
2. In modes 2 and 4, the initial value is H'00.
3. In modes 3 and 4, the initial value is H'EE.
Register Configuration
Register Descriptions
Bus Width Control Register (ABWCR)
1
Initial value
Read/Write
Initial value
Read/Write
Bus Controller Registers
Name
Bus width control register
Access state control register
Wait control register H
Wait control register L
Bus release control register
Chip select control register
Address control register
Bus control register
ABW7
R/W
R/W
7
1
0
15
to D
ABW6
R/W
R/W
8
6
1
0
) is valid, and port 4 is an input/output port. When at least one
ABW5
R/W
R/W
5
1
0
ABW4
R/W
R/W
4
1
0
Abbreviation
ABWCR
ASTCR
WCRH
WCRL
BRCR
ADRCR
BCR
CSCR
ABW3
R/W
R/W
3
1
0
ABW2
R/W
R/W
2
1
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
ABW1
R/W
R/W
1
1
0
Initial Value
H'FF*
H'FF
H'FF
H'FF
H'FE*
H'0F
H'FF
H'C6
ABW0
2
3
R/W
R/W
15
0
1
0
to
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