M30620MCM Datasheet, PDF (26/33 Pages) Mitsubishi Electric Semiconductor – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Usage precaution
Mitsubishi microcomputers
M16C / 62M Group
(Low voltage version)
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Notes on the microprocessor mode and transition after shifting from the micropro-
cessor mode to the memory expansion mode
• Microprocessor mode
In microprocessor mode, the SFR, internal RAM, and external memory space can be accessed.
For that reason, the internal ROM area cannot be accessed.
• Memory expansion mode
In memory expansion mode, external memory can be accessed in addition to the internal memory
space (SFR, internal RAM, and internal ROM).
However, after the reset has been released and the operation of shifting from the microprocessor
mode has started (“H” applied to the CNVSS pin), the internal ROM area cannot be accessed even if
the CPU shifts to the memory expansion mode.
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