upd78f0134hgka1-9et-a Renesas Electronics Corporation., upd78f0134hgka1-9et-a Datasheet - Page 374
upd78f0134hgka1-9et-a
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upd78f0134hgka1-9et-a
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8-bit Single-chip Microcontrollers
Manufacturer
Renesas Electronics Corporation.
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request INTyy is not acknowledged and multiple interrupt servicing does not take place. The INTyy interrupt request
is held pending, and is acknowledged following execution of one main processing instruction.
374
Example 3. Multiple interrupt servicing does not occur because interrupts are not enabled
Interrupts are not enabled during servicing of interrupt INTxx (EI instruction is not issued), therefore, interrupt
PR = 0: Higher priority level
IE = 0:
Interrupt request acknowledgement disabled
Figure 17-10. Examples of Multiple Interrupt Servicing (2/2)
(PR = 0)
INTxx
1 instruction execution
Main processing
EI
CHAPTER 17 INTERRUPT FUNCTIONS
User’s Manual U16899EJ3V0UD
IE = 1
IE = 0
(PR = 0)
INTyy
IE = 1
INTxx servicing INTyy servicing
IE = 0
RETI
RETI
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