HD6412340 HITACHI [Hitachi Semiconductor], HD6412340 Datasheet - Page 165
HD6412340
Manufacturer Part Number
HD6412340
Description
H8S/2345 F-ZTAT Hardware Manual
Manufacturer
HITACHI [Hitachi Semiconductor]
Datasheet
1.HD6412340.pdf
(907 pages)
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Areas 1 to 6: In external expansion mode, all of areas 1 to 6 is external space.
When area 1 to 3 external space is accessed, the CS1 to CS3 pin signals respectively can be
output.
Only the basic bus interface can be used for areas 1 to 6.
Area 7: Area 7 includes the on-chip RAM and internal I/O registers. In external expansion mode,
the space excluding the on-chip RAM and internal I/O registers is external space. The on-chip
RAM is enabled when the RAME bit in the system control register (SYSCR) is set to 1; when the
RAME bit is cleared to 0, the on-chip RAM is disabled and the corresponding space becomes
external space.
Only the basic bus interface can be used for the area 7 memory interface.
6.3.5
Areas in Normal Mode (ZTAT, Mask ROM, and ROMless versions Only)
In normal mode, a 64-kbyte address space comprising part of area 0 is controlled. Area
partitioning is not performed in normal mode. In ROM-disabled expansion mode, the space
excluding the on-chip RAM and internal I/O registers is external space. In ROM-enabled
expansion mode the space excluding the on-chip ROM, on-chip RAM, and internal I/O registers is
external space. The on-chip RAM is enabled when the RAME bit in the system control register
(SYSCR) is set to 1; when the RAME bit is cleared to 0, the on-chip RAM is disabled and the
corresponding space becomes external space .
When external space is accessed, the CS0 signal can be output.
The basic bus interface or burst ROM interface can be selected.
146
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