Renesas RL78/F13 User Manual

RL78/F13, F14 CHAPTER 21 INTERRUPT FUNCTIONS
R01UH0368EJ0210 Rev.2.10 1511
Dec 10, 2015
Figure 21-14. Examples of Multiple Interrupt Servicing (2/2)
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 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.
PR = 00: Specify level 0 with PR1 = 0, PR0 = 0 (higher priority level)
PR = 01: Specify level 1 with PR1 = 0, PR0 = 1
PR = 10: Specify level 2 with PR1 = 1, PR0 = 0
PR = 11: Specify level 3 with PR1 = 1, PR0 = 1 (lower priority level)
IE = 0: Interrupt request acknowledgment is disabled
IE = 1: Interrupt request acknowledgment is enabled.
Main processing INTxx servicing INTyy servicing
EI
1 instruction execution
RETI
RETI
INTxx
(PR = 11)
INTyy
(PR = 00)
IE = 0
IE = 0
IE = 1
IE = 1

Renesas RL78/F13 Specifications

General

Brand	Renesas
Model	RL78/F13
Category	Computer Hardware
Language	English