UPD78F0078GK-9ET-A Renesas Electronics America, UPD78F0078GK-9ET-A Datasheet - Page 417

• Manufacturer Part Number: UPD78F0078GK-9ET-A
• Manufacturer: Renesas Electronics America

Specifications of UPD78F0078GK-9ET-A

• Lead Free Status / Rohs Status: Supplier Unconfirmed

Example 3. Multiple interrupt servicing does not occur because interrupts are not enabled
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.
Interrupts are not enabled during servicing of interrupt INTxx (EI instruction is not issued), so interrupt request INTyy
PR = 0:
IE = 0:
Higher priority level
Interrupt request acknowledgment disabled
(PR = 0)
INTxx
1 instruction execution
Figure 19-13. Examples of Multiple Interrupt Servicing (2/2)
Main processing
EI
CHAPTER 19 INTERRUPT FUNCTIONS
IE = 1
User’s Manual U14260EJ4V0UD
IE = 0
(PR = 0)
INTyy
INTxx servicing INTyy servicing
IE = 0
IE = 1
RETI
RETI
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