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INTERRUPT CONTROLLER (ICU)
5.1 Outline of the Interrupt Controller (ICU)
5.1 Outline of Interrupt Controller (ICU)
The Interrupt Controller (ICU) manages maskable interrupts from internal peripheral I/Os and a
system break interrupt (SBI). The maskable interrupts from internal peripheral I/Os are notified to
the M32R CPU as external interrupts (EI).
There are a total of 31 interrupt sources for the maskable interrupts from internal peripheral I/Os,
which are managed by assigning them one of eight priority levels including an interrupt-disabled
state. When multiple interrupt requests of the same priority level occur simultaneously, their
priorities are resolved by predetermined hardware priority. The source of an interrupt request
generated in internal peripheral I/Os is identified by reading the relevant interrupt status register
provided for internal peripheral I/Os.
On the other hand, the system break interrupt (SBI) is recognized when a low-going transition
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occurs on the SBI signal input pin. This interrupt is used for emergency purposes such as when
power outage is detected or a fault condition is notified by an external watchdog timer, so that it is
always accepted irrespective of the PSW register IE bit status. When the ICU has finished servicing
an SBI, terminate or reset the system without returning to the program that was being executed
when the interrupt occurred.
Specifications of the interrupt controller are outlined in the table below.
Table 5.1.1 Outline of Interrupt Controller (ICU)
Item
Specification
Interrupt source
Maskable interrupt from internal peripheral I/O : 31 sources
System break interrupt
: 1 source (entered from SBI pin)
Level management
Eight levels including an interrupt-disabled state
(However, interrupts of the same level have their priorities resolved by fixed
hardware priority.)
Содержание M32170F3VFP
Страница 19: ...CHAPTER 1 CHAPTER 1 OVERVIEW 1 1 Outline of the 32170 1 2 Block Diagram 1 3 Pin Function 1 4 Pin Layout ...
Страница 42: ...1 1 24 Ver 0 10 OVERVIEW 1 4 Pin Layout This is a blank page ...
Страница 56: ...2 2 14 Ver 0 10 This is a blank page ...
Страница 88: ...3 3 32 Ver 0 10 ADDRESS SPACE 3 7 Notes on Address Space This is a blank page ...
Страница 192: ...6 6 58 Ver 0 10 INTERNAL MEMORY 6 9 Precautions to Be Taken When Rewriting Flash Memory This is a blank page ...
Страница 270: ...9 9 40 Ver 0 10 DMAC 9 4 Precautions about the DMAC This is a blank page ...
Страница 498: ...10 10 228 Ver 0 10 MULTIJUNCTION TIMERS 10 9 TOM Output related 16 bit Timer This is a blank page ...
Страница 550: ...11 11 52 Ver 0 10 A D CONVERTERS 11 4 Precautions on Using A D Converters This is a blank page ...
Страница 614: ...12 12 64 Ver 0 10 This is a blank page SERIAL I O 12 9 Precautions on Using UART Mode ...
Страница 710: ...14 14 16 Ver 0 10 REAL TIME DEBUGGER RTD 14 4 Typical Connection with the Host This is a blank page ...
Страница 746: ...16 16 20 Ver 0 10 WAIT CONTROLLER 16 3 Typical Operation of the Wait Controller This is a blank page ...
Страница 756: ...17 17 10 Ver 0 10 RAM BACKUP MODE 17 4 Exiting RAM Backup Mode Wakeup This is a blank page ...
Страница 757: ...CHAPTER 18 CHAPTER 18 OSCILLATION CIRCUIT 18 1 Oscillator Circuit 18 2 Clock Generator Circuit ...
Страница 762: ...18 18 6 Ver 0 10 OSCILLATION CIRCUIT 18 2 Clock Generator Circuit This is a blank page ...
Страница 798: ...19 19 36 Ver 0 10 JTAG 19 6 Precautions about Board Design when Connecting JTAG This is a blank page ...
Страница 830: ...21 21 24 Ver 0 10 PRELIMINARY PRELIMINARY This is a blank page ELECTRICAL CHARACTERISTICS 21 5 AC Characteristics ...
Страница 831: ...CHAPTER 22 CHAPTER 22 TYPICAL CHARACTERISTICS 22 1 A D Conversion Characteristics ...
Страница 833: ...Appendix 1 1 Dimensional Outline Drawing APPENDIX 1 APPENDIX 1 MECHANICAL SPECIFICATIONS ...
Страница 837: ...Appendix 2 1 32170 Instruction Processing Time APPENDIX 2 APPENDIX 2 INSTRUCTION PROCESSING TIME ...
Страница 841: ...Appendix 3 1 Precautions about Noise APPENDIX 3 APPENDIX 3 PRECAUTIONS ABOUT NOISE ...