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CHAPTER 7 INTERRUPT
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Hardware Interrupt Operation
Figure 7.4-2 shows hardware interrupt operation from generation of a hardware interrupt to the completion
of interrupt processing.
Figure 7.4-2 Hardware Interrupt Operation
(1) An interrupt cause is generated within the peripheral function.
(2) The interrupt enable bit of the peripheral function is referenced. If the interrupt is enabled, the
interrupt request is output from the peripheral function to the interrupt controller.
(3) The interrupt controller that receives the interrupt request determines the priority of simultaneous
interrupt requests, then transfers the interrupt level (IL) that matches the corresponding interrupt
request to the CPU.
(4) The CPU compares the interrupt level (IL) requested by the interrupt controller with the interrupt level
mask register (ILM).
(5) If the comparison indicates a higher priority than the current interrupt processing level, the CPU checks
the contents of the I flag in the condition code register (CCR).
(6) If in the check in (5) the I flag is interrupt enabled (I = 1), the CPU waits until the execution of the
instruction currently being executed terminates. At termination, the CPU sets the requested level (IL)
in the ILM.
(7) Registers are saved, and processing branches to the interrupt processing routine.
(8) The interrupt cause that was generated in (1) is cleared by software in the interrupt processing routine.
Execution of the RETI instruction terminates the interrupt processing.
Internal bus
Microcode
Check
Comparator
Other peripheral
Peripheral function that generated
Enable FF
Factor FF
Level Interrupt
Interrupt controller
the interrupt request
functions
comparator
level IL
IL:
PS:
I:
ILM:
IR:
FF:
Interrupt level setting bit in the interrupt control register (ICR)
Processor status
Interrupt enable flag
Interrupt level mask register
Instruction register
Flip-flop
X
Содержание MB90460 Series
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Страница 131: ...112 CHAPTER 6 LOW POWER CONSUMPTION MODE ...
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Страница 181: ...162 CHAPTER 8 MODE SETTING ...
Страница 223: ...204 CHAPTER 9 I O PORT ...
Страница 237: ...218 CHAPTER 10 TIME BASE TIMER ...
Страница 247: ...228 CHAPTER 11 WATCHDOG TIMER ...
Страница 275: ...256 CHAPTER 12 16 BIT RELOAD TIMER ...
Страница 373: ...354 CHAPTER 14 MULTI FUNCTIONAL TIMER ...
Страница 485: ...466 CHAPTER 16 PWC Timer ...
Страница 531: ...512 CHAPTER 17 UART ...
Страница 559: ...540 CHAPTER 19 DELAYED INTERRUPT GENERATOR MODULE ...
Страница 589: ...570 CHAPTER 20 8 10 BIT A D CONVERTER ...
Страница 601: ...582 CHAPTER 21 ROM CORRECTION FUNCTION ...
Страница 633: ...614 CHAPTER 23 512K 1024K BIT FLASH MEMORY ...
Страница 645: ...626 CHAPTER 24 EXAMPLE OF F2 MC 16LX MB90F462 F462A F463A CONNECTION FOR SERIAL WRITING ...
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Страница 716: ...697 INDEX INDEX The index follows on the next page This is listed in alphabetic order ...
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