Datenblatt-Suchmaschine für elektronische Bauteile |
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HT82R732 Datenblatt(PDF) 45 Page - Holtek Semiconductor Inc |
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HT82R732 Datenblatt(HTML) 45 Page - Holtek Semiconductor Inc |
45 / 74 page Once an interrupt subroutine is serviced, all the other interrupts will be blocked, as the EMI bit will be cleared automatically. This will prevent any further interrupt nesting from occurring. However, if other interrupt requests occur during this interval, although the interrupt will not be immediately serviced, the request flag will still be recorded. If an interrupt requires immediate servicing while the program is already in another interrupt service routine, the EMI bit should be set after entering the routine, to allow interrupt nesting. If the stack is full, the interrupt request will not be acknowledged, even if the related interrupt is enabled, until the Stack Pointer is decremented. If immediate service is desired, the stack must be prevented from becoming full. When an interrupt request is generated, it takes 2 or 3 instruction cycle before the program jumps to the interrupt vector. If the device is in the Sleep or Idle Mode and is woken up by an interrupt request, then it will take 3 cycles before the program jumps to the interrupt vector. HT82R732 e-Banking 8-Bit OTP MCU Rev. 1.00 45 October 31, 2013 Wait for 2 ~ 3 Instruction Cycles Main Program ISR Entry Enable Bit Set ? Main Program RETI (it will set EMI automatically) Automatically Disable Interrupt Clear EMI & Request Flag Interrupt Request or Interrupt Flag Set by Instruction Y N Interrupt Flow |
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