Rev. 1.0, 09/01, page 117 of 904
6.3.5
&6
&6
&6
&6
Assertion Period Control Registers H, L (CSACRH, CSACRL)
CSACRH and CSACRL select whether or not the assertion period of the basic bus interface chip
select signals (
&6Q
) and address signals is to be extended. Extending the assertion period of the
&6Q
and address signals allows flexible interfacing to external I/O devices.
•
CSACRH
Bit
Bit Name
Initial Value
R/W
Description
7
6
5
4
3
2
1
0
CSXH7
CSXH6
CSXH5
CSXH4
CSXH3
CSXH2
CSXH1
CSXH0
0
0
0
0
0
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
&6
and Address Signal Assertion Period
Control 1
These bits specify whether or not the T
h
cycle is
to be inserted (see figure 6.3). When an area for
which the CSXHn bit is set to 1 is accessed, a
one-state T
h
cycle, in which only the
&6Q
and
address signals are asserted, is inserted before
the normal access cycle.
0: In area n basic bus interface access, the
&6Q
and address assertion period (T
h
) is not
extended
1: In area n basic bus interface access, the
&6Q
and address assertion period (T
h
) is extended
(n = 7 to 0)
•
CSACRL
Bit
Bit Name
Initial Value
R/W
Description
7
6
5
4
3
2
1
0
CSXT7
CSXT6
CSXT5
CSXT4
CSXT3
CSXT2
CSXT1
CSXT0
0
0
0
0
0
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
&6
and Address Signal Assertion Period
Control 2
These bits specify whether or not the T
t
cycle
shown in figure 6.3 is to be inserted. When an
area for which the CSXTn bit is set to 1 is
accessed, a one-state T
t
cycle, in which only the
&6Q
and address signals are asserted, is
inserted before the normal access cycle.
0: In area n basic bus interface access, the
&6Q
and address assertion period (T
t
) is not
extended
1: In area n basic bus interface access, the
&6Q
and address assertion period (T
t
) is extended
(n = 7 to 0)
Содержание H8S/2376 F-ZTAT
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