upd78f0730 Renesas Electronics Corporation., upd78f0730 Datasheet - Page 407

• Manufacturer Part Number: upd78f0730
• Description: 8-bit Single-chip Microcontroller
• 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 acknowledgement disabled
Figure 13-10. Examples of Multiple Interrupt Servicing (2/2)
(PR = 0)
INTxx
1 instruction execution
Main processing
EI
CHAPTER 13 INTERRUPT FUNCTIONS
Preliminary User’s Manual U19014EJ1V0UD
IE = 1
IE = 0
(PR = 0)
INTyy
IE = 1
INTxx servicing INTyy servicing
IE = 0
RETI
RETI
407