Rev. 1.0, 09/01, page 120 of 904
6.3.7
Bus Control Register (BCR)
BCR is used for idle cycle settings, selection of the external bus released state protocol, enabling
or disabling of the write data buffer function, and enabling or disabling of
:$,7
pin input.
Bit
Bit Name
Initial Value
R/W
Description
15
BRLE
0
R/W
Bus Release Enable
Enables or disables external bus release.
0: External bus release disabled
%5(4
,
%$&.
, and
%5(42
pins can be used
as I/O ports
1: External bus release enabled
14
BREQOE
0
R/W
%5(42
Pin Enable
Controls outputting the bus request signal
(BREQO) to the external bus master in the
external bus released state, when an internal
bus master performs an external address space
access, or when a refresh request is generated.
0:
%5(42
output disabled
%5(42
pin can be used as I/O port
1:
%5(42
output enabled
13
−
0
R/W
Reserved
This bit is always read as 0. The initial value
should not be changed.
12
IDLC
1
R/W
Idle Cycle State Number Select
Specifies the number of states in the idle cycle
set by ICIS2, ICIS1, and ICIS0.
0: Idle cycle comprises 1 state
1: Idle cycle comprises 2 states
11
ICIS1
1
R/W
Idle Cycle Insert 1
When consecutive external read cycles are
performed in different areas, an idle cycle can
be inserted between the bus cycles.
0: Idle cycle not inserted
1: Idle cycle inserted
Summary of Contents for H8S/2376 F-ZTAT
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