HD6413003RVF RENESAS [Renesas Technology Corp], HD6413003RVF Datasheet - Page 122
HD6413003RVF
Manufacturer Part Number
HD6413003RVF
Description
microcontroller (MCU)
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6413003RVF.pdf
(715 pages)
- Current page: 122 of 715
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6.2 Register Descriptions
6.2.1 Bus Width Control Register (ABWCR)
ABWCR is an 8-bit readable/writable register that selects 8-bit or 16-bit access for each area.
When ABWCR contains H'FF (selecting 8-bit access for all areas), the H8/3003 operates in 8-bit
bus mode: the upper data bus (D
one bit is cleared to 0 in ABWCR, the H8/3003 operates in 16-bit bus mode with a 16-bit data bus
(D
mode. In modes 2 and 4, ABWCR is initialized to H'00 by a reset and in hardware standby mode.
ABWCR is not initialized in software standby mode.
Bits 7 to 0—Area 7 to 0 Bus Width Control (ABW7 to ABW0): These bits select 8-bit access
or 16-bit access to the corresponding address areas.
Bits 7 to 0
ABW7 to ABW0
0
1
ABWCR specifies the bus width of external memory areas. The bus width of on-chip memory and
registers is fixed and does not depend on ABWCR settings.
Bit
Initial
value
Read/Write
15
to D
Mode 1, 3
Mode 2, 4
0
). In modes 1 and 3, ABWCR is initialized to H'FF by a reset and in hardware standby
Description
Areas 7 to 0 are 16-bit access areas
Areas 7 to 0 are 8-bit access areas
ABW7
R/W
7
1
0
ABW6
R/W
15
6
1
0
to D
8
Bits selecting bus width for each area
ABW5
) is valid, and port 4 is an input/output port. When at least
R/W
5
1
0
104
ABW4
R/W
4
1
0
ABW3
R/W
3
1
0
ABW2
R/W
2
1
0
ABW1
R/W
1
1
0
ABW0
R/W
0
1
0
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