Renesas RL78/F13 User Manual

RL78/F13, F14 CHAPTER 21 INTERRUPT FUNCTIONS
R01UH0368EJ0210 Rev.2.10 1510
Dec 10, 2015
Figure 21-14. Examples of Multiple Interrupt Servicing (1/2)
Example 1. Multiple interrupt servicing occurs twice
During servicing of interrupt INTxx, two interrupt requests, INTyy and INTzz, are acknowledged, and multiple interrupt
servicing takes place. Before each interrupt request is acknowledged, the EI instruction must always be issued to enable
interrupt request acknowledgment.
Example 2. Multiple interrupt servicing does not occur due to priority control
Interrupt request INTyy issued during servicing of interrupt INTxx is not acknowledged because its priority is lower than
that of INTxx, 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 INTzz servicing
EI
EI
EI
RETI RETI
RETI
INTxx
(PR = 11)
INTyy
(PR = 10)
INTzz
(PR = 01)
IE = 0 IE = 0 IE = 0
IE = 1 IE = 1
IE = 1
Main processing INTxx servicing INTyy servicing
INTxx
(PR = 10)
INTyy
(PR = 11)
EI
RETI
IE = 0
IE = 0
EI
1 instruction execution
RETI
IE = 1
IE = 1

Renesas RL78/F13 Specifications

General

Brand	Renesas
Model	RL78/F13
Category	Computer Hardware
Language	English