DF2211NP24V Renesas Technology / Hitachi Semiconductor, DF2211NP24V Datasheet - Page 172
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DF2211NP24V
Manufacturer Part Number
DF2211NP24V
Description
H8S/2200 Series, 2212 Group, USB, RTC, HSS TNP-64B; Vcc= 2.7 to 3.6 volts, Temp= -20 to 75 C; Package: PVQN0064LB-A
Manufacturer
Renesas Technology / Hitachi Semiconductor
Datasheet
1.DF2211NP24V.pdf
(756 pages)
- Current page: 172 of 756
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6.3
The following shows the registers of the bus controller.
• Bus width control register (ABWCR)
• Access state control register (ASTCR)
• Wait control register H (WCRH)
• Wait control register L (WCRL)
• Bus control register H (BCRH)
• Bus control register L (BCRL )
• Pin function control register (PFCR)
6.3.1
ABWCR designates each area for either 8-bit access or 16-bit access.
ABWCR sets the data bus width for the external memory space. The bus width for on-chip
memory and internal I/O registers except for the on-chip USB and RTC is fixed regardless of the
settings in ABWCR.
Notes: 1. In modes 5 to 7, initial value of each bit is 1. In mode 4, initial value of each bit is 0.
Rev.7.00 Dec. 24, 2008 Page 118 of 698
REJ09B0074-0700
Bit
7
6
5
4
3
2
1
0
Bit Name
ABW7*
ABW6*
ABW5
ABW4
ABW3
ABW2
ABW1
ABW0
2. The on-chip USB and on-chip RTC are allocated to area 6 and area 7, respectively.
Register Descriptions
Bus Width Control Register (ABWCR)
These bits should be set to 1 in the H8S/2212 Group.
Therefore, these bits should be set to 1.
2
2
Initial Value R/W
1/0*
1/0*
1/0*
1/0*
1/0*
1/0*
1/0*
1/0*
1
1
1
1
1
1
1
1
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Description
Area 7 to 0 Bus Width Control:
These bits select whether the corresponding area is to
be designated for 8-bit access or 16-bit access.
0: Area n is designated for 16-bit access
1: Area n is designated for 8-bit access
Legend: n = 7 to 0
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