HD6473032F Datasheet, PDF (75/572 Pages) Hitachi Semiconductor – Hitachi Microcomputer

3.4 Operating Mode Descriptions
3.4.1 Mode 1
1-Mbyte address space can be accessed including the on-chip ROM addresses. Port 3 pins
function as data pins D₇ to D₀ and port 1, 2, and 5 pins function as address pins A₁₉ to A₀. The
address bus width can be selected by setting DDR of ports 1, 2, and 5.
3.4.2 Mode 2
This mode is a normal mode with a 64-kbyte address space which operates using the on-chip
ROM, RAM, and registers. External addresses cannot be accessed. The vector area and stack area
can be saved.
3.4.3 Mode 3
This mode is an advanced mode with a 1-Mbyte address space which operates using the on-chip
ROM, RAM, and registers. External addresses cannot be accessed.
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