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CHAPTER 18 INTERRUPT FUNCTIONS AND TEST FUNCTION
466
Figure 18-15. Multiple Interrupt Examples (1/2)
Example 1. Two multiple interrupts are generated
The interrupt request INTyy generated during interrupt INTxx servicing is not acknowledged because the interrupt
priority is lower than that of INTxx, and a multiple interrupt is not generated. INTyy request is retained and
acknowledged after execution of 1 instruction execution of the main processing.
PR = 0 : High-priority level
PR = 1 : Low-priority level
IE = 0 : Interrupt request acknowledge disabled
During interrupt INTxx servicing, two interrupt requests, INTyy and INTzz are acknowledged, and a multiple
interrupt is generated. An EI instruction is issued before each interrupt request acknowledge, and the interrupt
request acknowledge enable state is set.
Example 2. Multiple interrupt is not generated by priority control
Main Processing
INTxx
Servicing
INTyy
Servicing
INTzz
Servicing
EI
INTxx
(PR = 1)
IE = 0
IE = 0
IE = 0
EI
EI
INTyy
(PR = 0)
INTzz
(PR = 0)
RETI
RETI
RETI
Main Processing
INTxx
Servicing
INTyy
Servicing
EI
INTxx
(PR = 0)
IE = 0
EI
INTyy
(PR = 1)
RETI
RETI
1 Instruction
Execution
IE = 0
Summary of Contents for 78014Y Series
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Page 446: ...www DataSheet4U com CHAPTER 17 SERIAL INTERFACE CHANNEL 1 446 MEMO...
Page 472: ...www DataSheet4U com CHAPTER 18 INTERRUPT FUNCTIONS AND TEST FUNCTION 472 MEMO...
Page 502: ...www DataSheet4U com CHAPTER 22 PD78P014 78P014Y 502 MEMO...
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