upd78f0124hgba1-8et-a Renesas Electronics Corporation., upd78f0124hgba1-8et-a Datasheet - Page 336
upd78f0124hgba1-8et-a
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upd78f0124hgba1-8et-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.
336
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 acknowledgment disabled
Figure 16-10. Examples of Multiple Interrupt Servicing (2/2)
(PR = 0)
INTxx
1 instruction execution
Main processing
EI
CHAPTER 16 INTERRUPT FUNCTIONS
User’s Manual U16962EJ3V0UD
IE = 1
IE = 0
(PR = 0)
INTyy
INTxx servicing INTyy servicing
IE = 0
IE = 1
RETI
RETI
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