upd78f0148m1gka1-9eu Renesas Electronics Corporation., upd78f0148m1gka1-9eu Datasheet - Page 435

• Manufacturer Part Number: upd78f0148m1gka1-9eu
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

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.
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 19-10. Examples of Multiple Interrupt Servicing (2/2)
(PR = 0)
INTxx
1 instruction execution
Main processing
EI
CHAPTER 19 INTERRUPT FUNCTIONS
User’s Manual U15947EJ3V1UD
IE = 1
IE = 0
(PR = 0)
INTyy
INTxx servicing INTyy servicing
IE = 0
IE = 1
RETI
RETI
435