Section 6 Bus Controller
Rev. 3.00 Jan 25, 2006 page 106 of 872
REJ09B0286-0300
6.3
Register Descriptions
The bus controller has the following registers. For details on the system control register, see
section 3.2.2, System Control Register (SYSCR).
•
Bus control register (BCR)
•
Bus control register 2 (BCR2)
•
Wait state control register (WSCR)
•
Wait state control register 2 (WSCR2)
6.3.1
Bus Control Register (BCR)
BCR is used to specify the access mode for the external address space or the I/O area range when
the
AS
/
IOS
pin is specified as an I/O strobe pin.
Bit
Bit Name
Initial Value
R/W
Description
7
1
R/(W)
Reserved
The initial value should not be changed.
6
ICIS
1
R/W
Idle Cycle Insertion
Selects whether or not to insert 1-state of the idle
cycle between successive external read and
external write cycles.
0: Idle cycle not inserted
1: 1-state idle cycle inserted
5
BRSTRM
0
R/W
Burst ROM Enable
Selects the bus interface for the external address
space.
0: Basic bus interface
1: Burst ROM interface
When the CS256E bit in SYSCR and the CPCSE
bit in BCR2 are set to 1, burst ROM interface
cannot be selected for the 256-kbyte expansion
area and CP/CF expansion area.
Содержание H8S/2158
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Страница 440: ...Section 15 Watchdog Timer WDT Rev 3 00 Jan 25 2006 page 386 of 872 REJ09B0286 0300...
Страница 606: ...Section 17 I 2 C Bus Interface IIC Rev 3 00 Jan 25 2006 page 552 of 872 REJ09B0286 0300...
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