User’s Manual U16899EJ2V0UD
355
CHAPTER 17 INTERRUPT FUNCTIONS
17.1 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 a high interrupt priority group
and a low interrupt priority group by setting the priority specification flag registers (PR0L, PR0H, PR1L, PR1H).
Multiple interrupt servicing can be applied to low-priority interrupts when high-priority interrupts are generated. If
two or more interrupts with the same priority are generated simultaneously, each interrupt is serviced according to
its predetermined priority (see Table 17-1).
A standby release signal is generated and STOP and HALT modes are released.
Nine external interrupt requests and 19 (16 in the
µ
PD78F0132H) internal interrupt requests are provided as
maskable interrupts.
(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.
17.2 Interrupt Sources and Configuration
A total of 29 (26 in the
µ
PD78F0132H) interrupt sources exist for maskable and software interrupts (see Table 17-
1).
Содержание MuPD78F0132H
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