
Rev. 1.0, 09/01, page 122 of 904
6.3.8
DRAM Control Register (DRAMCR)
DRAMCR is used to make DRAM/synchronous DRAM* interface settings.
Note: * The synchronous DRAM interface is not supported in the H8S/2378 Serise.
Bit
Bit Name
Initial Value
R/W
Description
15
OEE
0
R/W
2(
Output Enable
The OE signal used when EDO page mode
DRAM is connected can be output from the
(OE) pin. The
2(
signal is common to all areas
designated as DRAM space.
When the synchronous DRAM is connected, the
CKE signal can be output from the (OE) pin.
The CKE signal is common to the continuous
synchronous DRAM space.
0:
2(
/CKE signal output disabled
(
2(
)/(CKE) pin can be used as I/O port
1:
2(
/CKE signal output enabled
14
RAST
0
R/W
5$6
Assertion Timing Select
Selects whether, in DRAM access, the
5$6
signal is asserted from the start of the T
r
cycle
(rising edge of ø) or from the falling edge of ø.
Figure 6.4 shows the relationship between the
RAST bit setting and the
5$6
assertion timing.
The setting of this bit applies to all areas
designated as DRAM space.
0:
5$6
is asserted from ø falling edge in T
r
cycle
1:
5$6
is asserted from start of T
r
cycle
13
−
0
R/W
Reserved
This bit is always read as 0. The initial value
should not be changed.
Содержание H8S/2376 F-ZTAT
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