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CHAPTER 18 INTERRUPT FUNCTIONS AND TEST FUNCTION
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CHAPTER 18 INTERRUPT FUNCTIONS AND TEST FUNCTION
18.1 Interrupt Function Types
The following three types of interrupt functions are used.
(1) Non-maskable interrupt
This interrupt is acknowledged unconditionally even in a disabled state. It does not undergo interrupt priority
control and is given top priority over all other interrupt requests.
It generates a standby release signal.
The non-maskable interrupt has one source of interrupt request from the watchdog timer.
(2) 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 specify flag register (PR0L, PR0H). Multiple high priority
interrupts can be applied to low priority interrupts. If two or more interrupts with the same priority are
simultaneously generated, each interrupt has a predetermined priority (see Table 18-1).
A standby release signal is generated.
The maskable interrupt has four sources of external interrupt requests and eight sources of internal interrupt
requests.
(3) Software interrupt
This is a vectored interrupt to be generated by executing the BRK instruction. It is acknowledged even in a
disabled state. The software interrupt does not undergo interrupt priority control.
18.2 Interrupt Sources and Configuration
There are total of 14 non-maskable, maskable and software interrupts in the interrupt sources (see Table 18-1).
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