Rev.6.00 Oct.28.2004 page 114
of 1016
REJ09B0138-0600H
Bit 3—Burst Cycle Select 0 (BRSTS0): Selects the number of words that can be accessed in a burst ROM interface burst
access.
Bit 3
BRSTS0
Description
0
Max. 4 words in burst access
(Initial value)
1
Max. 8 words in burst access
Bits 2 to 0—RAM Type Select (RMTS2 to RMTS0): These bits select the memory interface for areas 2 to 5 in advanced
mode.
When DRAM space is selected, the relevant area is designated as DRAM interface.
Bit 2
RMTS2
Bit 1
RMTS1
Bit 0
RMTS0
Description
Area 5
Area 4
Area 3
Area 2
0
0
0
Normal space
1
Normal space
DRAM space
1
0
Normal space
DRAM space
1
DRAM space
1
—
—
—
Note:
When areas selected in DRAM space are all 8-bit space, the PF
2
pin can be used as an I/O port,
BREQO
, or
WAIT
.
6.2.5
Bus Control Register L (BCRL)
Bit
:
7
6
5
4
3
2
1
0
BRLE
BREQOE
EAE
LCASS
DDS
—
WDBE
WAITE
Initial value :
0
0
1
1
1
1
0
0
R/W
:
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
BCRL is an 8-bit readable/writable register that performs selection of the external bus-released state protocol, the LCAS
signal, DMAC single address transfer, enabling or disabling of the write data buffer function, and enabling or disabling of
WAIT
pin input.
BCRL is initialized to H'3C by a power-on reset and in hardware standby mode. It is not initialized by a manual reset* or
in software standby mode.
Note:
* Manual reset is only supported in the H8S/2357 ZTAT.
Bit 7—Bus Release Enable (BRLE): Enables or disables external bus release.
Bit 7
BRLE
Description
0
External bus release is disabled.
BREQ
,
BACK
, and
BREQO
can be used as I/O ports.
(Initial value)
1
External bus release is enabled.
Содержание ZTAT H8S/2357F
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