290
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
µ
PD789488 and 78F9488, 5 external and 11 internal interrupt sources are incorporated as maskable
interrupts.
For the
µ
PD789489 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
µ
PD789488 and
78F9488, and a total of 23 for the
µ
PD789489 and 78F9489 (
Tables 16-1
and
16-2
).
Содержание PD789488
Страница 2: ...2 User s Manual U15331EJ4V1UD MEMO ...