16.1 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 a high interrupt priority group
and a low interrupt priority group by setting the priority specification flag registers (PR0L, PR0H, PR1L).
Multiple interrupt servicing can be applied to low-priority interrupts when high-priority interrupts are generated. If
two or more interrupts with the same priority are generated simultaneously, each interrupt is serviced according to
its predetermined priority (see Table 16-1).
A standby release signal is generated.
Eight external interrupt requests and 15 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.
16.2 Interrupt Sources and Configuration
A total of 24 interrupt sources exist for maskable and software interrupts (see Table 16-1).
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CHAPTER 16 INTERRUPT FUNCTIONS
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