H83029 Datasheet, PDF (174/1010 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series

Areas 2 to 5: In external expansion mode, areas 2 to 5 are entirely external space.
When area 2 to 5 external space is accessed, signals CS₂ to CS₅ can be output.
Basic bus interface or DRAM interface can be selected for areas 2 to 5. With the DRAM
interface, signals CS₂ to CS₅ are used as RAS signals.
The size of areas 2 to 5 is 128 kbytes in modes 1 and 2, and 2 Mbytes in modes 3, 4, and 5.
Area 7: Area 7 includes the on-chip RAM and registers. In external expansion mode, the space
excluding the on-chip RAM and 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 area 7 external space is accessed, the CS₇ signal can be output.
Only the basic bus interface can be used for the area 7 memory interface.
The size of area 7 is 128 kbytes in modes 1 and 2, and 2 Mbytes in modes 3, 4, and 5.
Rev. 2.0, 06/04, page 147 of 980