Rev. 1.0, 09/01, page 140 of 904
Only the basic bus interface can be used for area 6.
Area 7: Area 7 includes the on-chip RAM and internal/O registers. In externally expanded mode,
the space excluding the on-chip RAM and internal I/O registers is external address space. The on-
chip RAM is enabled when the RAME bit is set to 1 in the system control register (SYSCR); when
the RAME bit is cleared to 0, the on-chip RAM is disabled and the corresponding addresses are in
external address space.
When area 7 external address space is accessed, the
&6
:
signal can be output.
Only the basic bus interface can be used for the area 7 memory interface.
6.4.4
Chip Select Signals
This LSI can output chip select signals (
&6
3
to
&6
:
) for areas 0 to 7. The signal outputs low when
the corresponding external space area is accessed. Figure 6.7 shows an example of
&6
3
to
&6
:
signals output timing.
Enabling or disabling of
&6
3
to
&6
:
signals output is set by the data direction register (DDR) bit
for the port corresponding to the
&6
3
to
&6
:
pins.
In expanded mode with on-chip ROM disabled, the
&6
3
pin is placed in the output state after a
reset. Pins
&6
4
to
&6
:
are placed in the input state after a reset and so the corresponding DDR bits
should be set to 1 when outputting signals
&6
4
to
&6
:
.
In expanded mode with on-chip ROM enabled, pins
&6
3
to
&6
:
are all placed in the input state
after a reset and so the corresponding DDR bits should be set to 1 when outputting signals
&6
3
to
&6
:
.
When areas 2 to 5 are designated as DRAM space, outputs
&6
5
to
&6
8
are used as
5$6
#
signals.
When areas 2 to 5 are designated as continuous synchronous DRAM space in the H8S/2378R
Series, outputs
&6
5
,
&6
6
,
&6
7
, and
&6
8
are used as
5$6
,
&$6
,
:(
, and CLK signals.
Summary of Contents for H8S/2376 F-ZTAT
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