42
Reset state
Program halt state
Exception-handling state
Program execution state
Reset cleared
SLEEP instruction executed
Reset
occurs
Interrupt
source
Reset
occurs
Interrupt
source
Exception-
handling
complete
Reset occurs
Figure 2.14 State Transitions
2.9
Application Notes
2.9.1
Notes on Data Access to Empty Areas
The address space of the H8/3664 Series CPU includes empty areas in addition to the RAM,
registers, and ROM areas available to the user. If these empty areas are mistakenly accessed by an
application program, the following results will occur.
•
Data transfer from CPU to empty area
The transferred data will be lost. This action may also cause the CPU to misoperate.
•
Data transfer from empty area to CPU
Unpredictable data is transferred.
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