Renesas RL78 Series User Manual page 684

16-bit single-chip microcontrollers

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The interrupt function switches the program execution to other processing. When the branch processing is finished, the

program returns to the interrupted processing.

There are four external interrupt sources and 29 internal interrupt sources.

18.1 Interrupt Function Types

The following two types of interrupt functions are used.

(1) Maskable interrupts

These interrupts undergo mask control. Maskable interrupts can be divided into four priority groups by setting the

priority specification flag registers (PR00L, PR00H, PR01L, PR01H, PR02L, PR02H, PR03L, PR10L, PR10H, PR11L,

PR11H, PR12L, PR12H, PR13L).

Multiple interrupt servicing can be applied to low-priority interrupts when high-priority interrupts are generated. If two

or more interrupt requests, each having the same priority, are simultaneously generated, then they are processed

according to the default priority of vectored interrupt servicing. Default priority, see Table 18-1.

A standby release signal is generated and STOP, HALT, and SNOOZE modes are released.

External interrupt requests and internal interrupt requests are provided as maskable interrupts.

(2) Software interrupt

This is a vectored interrupt generated by executing the BRK instruction. It is acknowledged even when interrupts are

disabled. The software interrupt does not undergo interrupt priority control.

R01UH0515EJ0120 Rev.1.20

Dec 16, 2016

CHAPTER 18 INTERRUPT FUNCTIONS

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