UPD78F9418AGK-9EU Renesas Electronics America, UPD78F9418AGK-9EU Datasheet - Page 244

• Manufacturer Part Number: UPD78F9418AGK-9EU
• Manufacturer: Renesas Electronics America

Specifications of UPD78F9418AGK-9EU

• Lead Free Status / Rohs Status: Supplier Unconfirmed

processing. Before each interrupt request is acknowledged, the EI instruction is issued and the interrupt request is
enabled.
request INTyy is not acknowledged and multiple interrupts are not performed.
acknowledged after INTxx servicing is completed.
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The interrupt request INTyy is acknowledged and multiple interrupts are performed during the interrupt INTxx
Interrupt requests are disabled (the EI instruction is not issued) in the interrupt INTxx processing. The interrupt
IE = 0: Interrupt request disabled
INTxx
INTxx
Example 2. Multiple interrupts are not performed because interrupts are disabled
Main processing
Main processing
EI
EI
IE = 0
Example 1. Acknowledging multiple interrupts
Figure 15-15. Example of Multiple Interrupt
IE = 0
CHAPTER 15 INTERRUPT FUNCTIONS
User’s Manual U13952EJ3V1UD
INTyy
INTyy
INTxx processing
INTxx processing
IE = 0
RETI
RETI
EI
IE = 0
INTyy is held pending
INTyy processing
INTyy is held pending and is
INTyy processing
RETI
RETI