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20-9
20
MSM66591/ML66592 User's Manual
Chapter 20 Interrupt Request Processing Function
If a maskable interrupt is generated, the hardware automatically performs a series of
processes, which include:
• Saving program counter (PC)
• Saving accumulator (ACC)
• Saving local register base (LRB)
• Saving program status word (PSW)
• Resetting IRQ that generated maskable interrupt process
• Resetting MIE on PSW (MIE
←
"0" = acceptance of maskable interrupt disabled)
• Storing interrupt priority level (acceptance of interrupt with same or lower level
priority disabled)
• Loading value written to vector table to program counter
and then executing the first instruction of a maskable interrupt process.
Fourteen cycles are required to shift to each maskable interrupt process (Interrupt
transition cycle).
However, if the program memory space is 128K bytes (MSM66591) or 192K bytes
(ML66592) by setting bit 1 (LROM) of MEMSCON to "1", 17 cycles are required be-
cause cycles required to save the code segment register (CSR) are added.
When an interrupt generation condition is fulfilled by setting IRQ, IE, IP, or MIPF to "1"
by an instruction, the actual generation of the interrupt occurs after the execution of the
next instruction after the instruction that set the IRQ, IE, IP, or MIPF to "1".
It is necessary to execute an RTI instruction at the end of a maskable interrupt routine.
If an RTI instruction is executed, the hardware automatically performs a series of
processes, which include:
• Deleting highest level of stored interrupt priority level
• Restoring program status word (PSW) (MIE
←
"1")
• Restoring local register base (LRB)
• Restoring accumulator (ACC)
• Restoring program counter (PC)
and then ending the maskable interrupt routine.
[Note] If the program memory space is expanded to 128K bytes (MSM66591) or 192K
bytes (ML66592) by setting bit 1 (LROM) of MEMSCON to "1", the code segment
register (CSR) is saved or returned from.
Figure 20-1 (page 20-3) shows examples of saving and restoring PC, ACC, LRB and
PSW.
Содержание MSM66591
Страница 1: ...MSM66591 ML66592 User s Manual CMOS 16 bit microcontroller FEUL66591 66592 01 Issue Date Mar 4 2002...
Страница 15: ...Contents 12...
Страница 17: ......
Страница 18: ...Overview Chapter 1 1...
Страница 19: ......
Страница 30: ...Description of Pins Chapter 2 2...
Страница 31: ......
Страница 44: ...CPU Architecture Chapter 3 3...
Страница 45: ......
Страница 101: ...3 56 MSM66591 ML66592User sManual Chapter 3 CPU Architecture...
Страница 102: ...CPU Control Functions Chapter 4 4...
Страница 103: ......
Страница 111: ...4 8 MSM66591 ML66592User sManual Chapter 4 CPU Control Functions...
Страница 112: ...Memory Control Functions Chapter 5 5...
Страница 113: ......
Страница 117: ...5 4 MSM66591 ML66592User sManual Chapter 5 Memory Control Functions...
Страница 118: ...Port Functions Chapter 6 6...
Страница 119: ......
Страница 152: ...Output Pin Control Pin OE Chapter 7 7...
Страница 153: ......
Страница 155: ...7 2 MSM66591 ML66592User sManual Chapter 7 Output Pin Control Pin OE...
Страница 156: ...Clock Generation Circuit Chapter 8 8...
Страница 157: ......
Страница 160: ...Time Base Counter TBC Chapter 9 9...
Страница 161: ......
Страница 164: ...Watchdog Timer WDT Chapter 10 10...
Страница 165: ......
Страница 170: ...Flexible Timer FTM Chapter 11 11 11...
Страница 171: ......
Страница 213: ...11 42 MSM66591 ML66592User sManual Chapter 11 Flexible Timer FTM...
Страница 214: ...General Purpose 8 Bit Timer Function Chapter 12 12...
Страница 215: ......
Страница 223: ...12 8 MSM66591 ML66592User sManual Chapter 12 General Purpose 8 Bit Timer Function...
Страница 224: ...PWM Functions Chapter 13 13...
Страница 225: ......
Страница 244: ...Baud Rate Generator Functions Chapter 14 14...
Страница 245: ......
Страница 263: ...14 18 MSM66591 ML66592User sManual Chapter 14 Baud Rate Generator Functions...
Страница 264: ...Serial Port Functions Chapter 15 15...
Страница 265: ......
Страница 348: ...A D Converter Functions Chapter 16 16...
Страница 349: ......
Страница 381: ...16 32 MSM66591 ML66592User sManual Chapter 16 A D Converter Functions...
Страница 382: ...Transition Detector Functions Chapter 17 17...
Страница 383: ......
Страница 387: ...17 4 MSM66591 ML66592User sManual Chapter 17 Transition Detector Functions...
Страница 388: ...Peripheral Functions Chapter 18 18...
Страница 389: ......
Страница 392: ...External Interrupt Request Function Chapter 19 19...
Страница 393: ......
Страница 396: ...Interrupt Request Processing Function Chapter 20 20...
Страница 397: ......
Страница 407: ...20 10 MSM66591 ML66592User sManual Chapter 20 Interrupt Request Processing Function...
Страница 408: ...Bus Port Functions Chapter 21 21...
Страница 409: ......
Страница 413: ...21 4 MSM66591 ML66592User sManual Chapter 21 Bus Port Functions...
Страница 414: ...Expansion Port Chapter 22 22...
Страница 415: ......
Страница 420: ...Serial Port with FIFO SCI5 Chapter 23 23...
Страница 421: ......
Страница 431: ...23 10 MSM66591 ML66592User sManual Chapter 23 Serial Port with FIFO SCI5...
Страница 432: ...RAM Monitor Function Chapter 24 24...
Страница 433: ......
Страница 441: ...24 8 MSM66591 ML66592User sManual Chapter 24 RAM Monitor Function...
Страница 442: ...25 Electrical Characteristics Chapter 25...
Страница 443: ......
Страница 458: ...Package Dimensions Chapter 26 26...
Страница 459: ......
Страница 461: ...26 2 MSM66591 ML66592User sManual Chapter 26 Package Dimensions...
Страница 462: ...Revision History Chapter 27 27...
Страница 463: ......
Страница 465: ...27 2 MSM66591 ML66592User sManual Chapter 27 Revision History...