NEC switch - Manual (Page 163)

User’s Manual U12978EJ3V0UD
163
CHAPTER 11 INTERRUPT FUNCTIONS
11.1 Interrupt Function Types
The following two types of interrupt functions are used.
(1) Non-maskable interrupt
This interrupt is acknowledged unconditionally. It does no undergo interrupt priority control and is given top
priority over all other interrupt requests.
A standby release signal is generated.
One interrupt source from the watchdog timer is incorporated as a non-maskable interrupt.
(2) Maskable interrupt
These interrupts undergo mask control. If two or more interrupts with the same priority are simultaneously
generated, each interrupt has a predetermined priority as shown in Table 11-1.
A standby release signal is generated.
Two external and nine internal interrupt sources are incorporated as maskable interrupts.
11.2 Interrupt Sources and Configuration
A total of 12 non-maskable and maskable interrupts are incorporated as interrupt sources (see Table 11-1).