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15.1 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, PR10L, PR10H, PR11L,
PR11H, PR12L, PR12H).
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 priority of vectored interrupt servicing. For the priority order, see Table 15-1.
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.
External: 13, internal: 25
(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.
15.2 Interrupt Sources and Configuration
The 78K0R/KE3 has a total of 39 interrupt sources including maskable interrupts and software interrupts. In
addition, they also have up to five reset sources (see Table 15-1). 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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CHAPTER 15 INTERRUPT FUNCTIONS
User's Manual U17854EJ9V0UD
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