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20-8
MSM66591/ML66592 User's Manual
Chapter 20 Interrupt Request Processing Function
20.3 Operation of Maskable Interrupt
When an interrupt request signal is generated, the logic to notify about interrupt request
generation to the judgment logic of an interrupt priority functions as follows:
• Interrupt request signal is output from an interrupt generation source.
• If the corresponding bit of IRQD is "1", the interrupt request signal is ignored, and
nothing occurs to this interrupt. If the corresponding bit of IRQD is "0", the corre-
sponding IRQ bit becomes "1". The IRQ bit can also be set to "1" by executing a
write instruction.
• If either the corresponding IE bit or the MIE on PSW is "0" when the IRQ bit is "1",
interrupt generation wait status occurs. When the IRQ bit is "1", the judgment logic
of an interrupt priority functions if both the corresponding IE bit and the MIE on the
PSW are "1".
The judgment logic of an interrupt priority functions as follows.
• If MIPF on PSW is "0", the judgment logic of an interrupt priority does not function,
and an interrupt is immediately generated.
If MIPF on PSW is "1", one of level 0 to level 3 priorities is assigned to the interrupt
according to the corresponding bit of IPX0 and IPX1.
• If no interrupt has been executed when an interrupt generation request is sent to the
judgment logic of an interrupt priority, the interrupt is immediately generated.
• If one or more interrupts are in execution when an interrupt generation request is
sent to the judgment logic of an interrupt priority, and if the priority of the interrupt to
be requested is higher than the highest priority of the interrupt in execution, the
interrupt is immediately generated.
• If one or more interrupts are in execution when an interrupt generation request is
sent to the judgment logic of an interrupt priority, and if the priority of the interrupt to
be requested is the same as or lower than the highest priority of the interrupts in
execution, the interrupt generation wait status occurs.
Process except interrupt
[Note]
If interrupts occur at the same time, the one with the highest priority level has the priority.
If interrupts with the same priority level occur at the same time, the one with the lower interrupt vector
address has the priority.
Level 1 interrupt process
Level 2 interrupt process X:interrupt wait
X:interrupt wait
X:interrupt wait
●
:interrupt generated
Level 3 interrupt process X:interrupt wait
X:interrupt wait
X:interrupt wait
X:interrupt wait
NMI process
X:interrupt wait
X:interrupt wait
X:interrupt wait
X:interrupt wait
●
:interrupt generated
●
:interrupt generated
X:interrupt wait
X:interrupt wait
Level 0 interrupt process
●
:interrupt generated
Level 0 Interrupt
Request
Level 1 Interrupt
Request
●
:interrupt generated
●
:interrupt generated
Level 2 Interrupt
Request
●
:interrupt generated
Level 3 Interrupt
Request
●
:interrupt generated
●
:interrupt generated
●
:interrupt generated
X:interrupt wait
●
:interrupt generated
●
:interrupt generated
●
:interrupt generated
●
:interrupt generated
●
:interrupt generated
X:interrupt wait
NMI Request
Generated
Interrupt
Process
in execution
Summary of Contents for MSM66591
Page 15: ...Contents 12...
Page 17: ......
Page 18: ...Overview Chapter 1 1...
Page 19: ......
Page 30: ...Description of Pins Chapter 2 2...
Page 31: ......
Page 44: ...CPU Architecture Chapter 3 3...
Page 45: ......
Page 101: ...3 56 MSM66591 ML66592User sManual Chapter 3 CPU Architecture...
Page 102: ...CPU Control Functions Chapter 4 4...
Page 103: ......
Page 111: ...4 8 MSM66591 ML66592User sManual Chapter 4 CPU Control Functions...
Page 112: ...Memory Control Functions Chapter 5 5...
Page 113: ......
Page 117: ...5 4 MSM66591 ML66592User sManual Chapter 5 Memory Control Functions...
Page 118: ...Port Functions Chapter 6 6...
Page 119: ......
Page 152: ...Output Pin Control Pin OE Chapter 7 7...
Page 153: ......
Page 155: ...7 2 MSM66591 ML66592User sManual Chapter 7 Output Pin Control Pin OE...
Page 156: ...Clock Generation Circuit Chapter 8 8...
Page 157: ......
Page 160: ...Time Base Counter TBC Chapter 9 9...
Page 161: ......
Page 164: ...Watchdog Timer WDT Chapter 10 10...
Page 165: ......
Page 170: ...Flexible Timer FTM Chapter 11 11 11...
Page 171: ......
Page 213: ...11 42 MSM66591 ML66592User sManual Chapter 11 Flexible Timer FTM...
Page 214: ...General Purpose 8 Bit Timer Function Chapter 12 12...
Page 215: ......
Page 223: ...12 8 MSM66591 ML66592User sManual Chapter 12 General Purpose 8 Bit Timer Function...
Page 224: ...PWM Functions Chapter 13 13...
Page 225: ......
Page 244: ...Baud Rate Generator Functions Chapter 14 14...
Page 245: ......
Page 263: ...14 18 MSM66591 ML66592User sManual Chapter 14 Baud Rate Generator Functions...
Page 264: ...Serial Port Functions Chapter 15 15...
Page 265: ......
Page 348: ...A D Converter Functions Chapter 16 16...
Page 349: ......
Page 381: ...16 32 MSM66591 ML66592User sManual Chapter 16 A D Converter Functions...
Page 382: ...Transition Detector Functions Chapter 17 17...
Page 383: ......
Page 387: ...17 4 MSM66591 ML66592User sManual Chapter 17 Transition Detector Functions...
Page 388: ...Peripheral Functions Chapter 18 18...
Page 389: ......
Page 392: ...External Interrupt Request Function Chapter 19 19...
Page 393: ......
Page 396: ...Interrupt Request Processing Function Chapter 20 20...
Page 397: ......
Page 407: ...20 10 MSM66591 ML66592User sManual Chapter 20 Interrupt Request Processing Function...
Page 408: ...Bus Port Functions Chapter 21 21...
Page 409: ......
Page 413: ...21 4 MSM66591 ML66592User sManual Chapter 21 Bus Port Functions...
Page 414: ...Expansion Port Chapter 22 22...
Page 415: ......
Page 420: ...Serial Port with FIFO SCI5 Chapter 23 23...
Page 421: ......
Page 431: ...23 10 MSM66591 ML66592User sManual Chapter 23 Serial Port with FIFO SCI5...
Page 432: ...RAM Monitor Function Chapter 24 24...
Page 433: ......
Page 441: ...24 8 MSM66591 ML66592User sManual Chapter 24 RAM Monitor Function...
Page 442: ...25 Electrical Characteristics Chapter 25...
Page 443: ......
Page 458: ...Package Dimensions Chapter 26 26...
Page 459: ......
Page 461: ...26 2 MSM66591 ML66592User sManual Chapter 26 Package Dimensions...
Page 462: ...Revision History Chapter 27 27...
Page 463: ......
Page 465: ...27 2 MSM66591 ML66592User sManual Chapter 27 Revision History...