Description Of System Break Interrupt (Sbi) Operation; Acceptance Of Sbi; Sbi Processing By Handler - Mitsubishi Electric M32R Series User Manual

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5.6 Description of System Break Interrupt (SBI) Operation

5.6.1 Acceptance of SBI

System Break Interrupt (SBI) is an emergency interrupt which is used when power failure is
detected or a fault condition is notified by an external watchdog timer. The system break interrupt is
accepted anytime upon detection of a falling edge on the SBI signal regardless of how the PSW
register IE bit is set, and cannot be masked.

5.6.2 SBI Processing by Handler

When the system break interrupt generated has been serviced, always be sure to terminate or
reset the system without returning to the program that was being executed when the interrupt
occurred.
H'0000 0010
Program
being
executed
. .
. .
. .
Figure 5.6.1 Typical SBI Operation
5.6 Description of System Break Interrupt (SBI) Operation
SBI (System Break Interrupt)
vector entry
BRA instruction
SBI generated
Note: Do not return to the program that was being
executed when the interrupt occurred.
5-22
INTERRUPT CONTROLLER (ICU)
_______
SBI (System Break
Interrupt) handler
Processing to
terminate the system
Terminate or reset
the system
Ver.0.10