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CHAPTER 18 INTERRUPT FUNCTIONS AND TEST FUNCTION
467
Figure 18-15. Multiple Interrupt Example (2/2)
Example 3. A multiple interrupt is not generated because interrupts are not enabled
Because interrupts are not enabled in interrupt INTxx servicing (an EI instruction is not issued), interrupt request
INTyy is not acknowledged, and a multiple interrupt is not generated. The INTyy request is reserved and
acknowledged after 1 instruction execution of the main processing.
PR = 0 : High-priority level
IE = 0 : Interrupt request acknowledge disabled
Main Processing
INTxx
Servicing
INTyy
Servicing
EI
INTxx
(PR = 0)
IE = 0
INTyy
(PR = 0)
RETI
RETI
IE = 0
1 Instruction
Execution
Содержание 78014Y Series
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