Chapter 16 interrupt functions, 1 interrupt function types, 2 interrupt sources and configuration – NEC PD78F9488 User Manual
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User’s Manual U15331EJ4V1UD
CHAPTER 16 INTERRUPT FUNCTIONS
16.1 Interrupt Function Types
The following two types of interrupt functions are used.
(1) Non-maskable
interrupt
This interrupt is acknowledged unconditionally. It does not 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
This interrupt undergoes mask control. If two or more interrupts with the same priority are simultaneously
generated, each interrupt has a predetermined priority as shown in Tables 16-1 and 16-2.
A standby release signal is generated.
For the
µPD789488 and 78F9488, 5 external and 11 internal interrupt sources are incorporated as maskable
interrupts.
For the
µPD789489 and 78F9489, 6 external and 16 internal interrupt sources are incorporated as maskable
interrupts.
16.2 Interrupt Sources and Configuration
A total of 17 non-maskable and maskable interrupts are incorporated as interrupt sources for the
µPD789488 and
78F9488, and a total of 23 for the
µPD789489 and 78F9489 (Tables 16-1 and 16-2).