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Q
When detecting the software runaway by the watchdog timer, if not software reset but setting the
same value as the contents of the reset bector address to the watchdog timer interrupt bector
address is processed, how does it result in?
When branching to the reset branch address within the watchdog timer interrupt routine, how
does it result in?
A
The CPU registers and the SFR are not initialized in the above-mentioned way. Accordingly,
the user must perform the initial setting for these all by software.
The processor interrupt priority level (IPL) retains "7" of the watchdog timer interrupt priority
level, and that is not initialized. Consequently, all interrupt requests are not accepted.
When rewriting the IPL by software, save once the 16-bit immediate value to the stack area
and next restore that 16-bit immediate value to all bits of the processor status register (PS).
We recommend software reset in order to initialize the microcomputer for software runaway.
7751 Group User's Manual
APPENDIX
Appendix 9. Q & A
Watchdog timer
20–83
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