RL78/G15 CHAPTER 14 INTERRUPT FUNCTIONS
R01UH0959EJ0110 Rev.1.10 Page 600 of 765
Mar 7, 2023
CHAPTER 14 INTERRUPT FUNCTIONS
The interrupt function switches the program execution to other processing. When the branch processing is finished, the
program returns to the interrupted processing.
The number of interrupt sources differs depending on the product.
20-pin 16-pin 10-pin 8-pin
Maskable interrupts External 8 8 8 6
Internal 19 16 10 10
14.1 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, PR10L, PR10H, PR11L, PR11H). 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. For default priority, see Table 14-1.
A standby release signal is generated and STOP and HALT 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.
14.2 Interrupt Sources and Configuration
Interrupt sources include maskable interrupts and software interrupts. In addition, they also have up to five reset sources
(see Table 14-1). The vector codes that store the program start address when branching due to the generation of a reset
or various interrupt requests are two bytes each, so interrupts jump to a 64 K address of 00000H to 0FFFFH.
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