Description Of System Break Interrupt (Sbi) Operation; Acceptance Of Sbi; Sbi Processing By Handler - Renesas M32R/ECU 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 outage is detected or a fault
condition is notified by an external watchdog timer. The system break interrupt is accepted anytime upon detec-
tion of a falling edge on the SBI# signal input pin no matter 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, shut down or reset the system without returning
to the program that was being executed when the interrupt occurred.
H'0000 0010
Program being
executed
Note 1: Do not return to the program that was being executed when the interrupt occurred.
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
INTERRUPT CONTROLLER (ICU)
SBI (System Break Interrupt)
Processing to shut
down the system
(Note 1)
Shut down or
reset the system
5-18
handler
32180 Group User's Manual (Rev.1.0)