4
4-16
Ver.0.10
4.9.2 System Break Interrupt (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
cannot be masked by the PSW register IE bit. Therefore, the system break interrupt can only be
used when some fatal event has already occurred to the system when the interrupt is detected.
Also, this interrupt must be used on condition that after processing by the SBI handler, control will
not return to the program that was being executed when the system break interrupt occurred.
[Occurrence Conditions]
_______
A system break interrupt is accepted by a falling edge on SBI input pin. (The system break
interrupt cannot be masked by the PSW register IE bit.)
In no case will a system break interrupt be activated immediately after executing a 16-bit
instruction that starts from a word boundary. (For 16-bit branch instructions, however, the
interrupt may be accepted immediately after branching.)
Figure 4.9.1 Timing at Which System Break Interrupt (SBI) is Accepted
16-bit instruction
Order in which instructions are executed
Address 1000
Interrupt may
be accepted
Interrupt
cannot be
accepted
Address 1002
Address 1004
Address 1008
16-bit instruction
32-bit instruction
Interrupt may
be accepted
Interrupt may
be accepted
EIT
4.9 Interrupt Processing
Summary of Contents for M32170F3VFP
Page 42: ...1 1 24 Ver 0 10 OVERVIEW 1 4 Pin Layout This is a blank page ...
Page 56: ...2 2 14 Ver 0 10 This is a blank page ...
Page 88: ...3 3 32 Ver 0 10 ADDRESS SPACE 3 7 Notes on Address Space This is a blank page ...
Page 270: ...9 9 40 Ver 0 10 DMAC 9 4 Precautions about the DMAC This is a blank page ...
Page 614: ...12 12 64 Ver 0 10 This is a blank page SERIAL I O 12 9 Precautions on Using UART Mode ...
Page 756: ...17 17 10 Ver 0 10 RAM BACKUP MODE 17 4 Exiting RAM Backup Mode Wakeup This is a blank page ...
Page 762: ...18 18 6 Ver 0 10 OSCILLATION CIRCUIT 18 2 Clock Generator Circuit This is a blank page ...
Page 831: ...CHAPTER 22 CHAPTER 22 TYPICAL CHARACTERISTICS 22 1 A D Conversion Characteristics ...
Page 833: ...Appendix 1 1 Dimensional Outline Drawing APPENDIX 1 APPENDIX 1 MECHANICAL SPECIFICATIONS ...
Page 841: ...Appendix 3 1 Precautions about Noise APPENDIX 3 APPENDIX 3 PRECAUTIONS ABOUT NOISE ...