UPD78F0138 NEC, UPD78F0138 Datasheet - Page 360

• Manufacturer Part Number: UPD78F0138
• Description: (UPD78xxxx) 8-Bit Single-Chip Microcontrollers
• Manufacturer: NEC

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17.1 Interrupt Function Types
(1) Maskable interrupts
(2) Software interrupt
17.2 Interrupt Sources and Configuration
Table 17-1).
The following two types of interrupt functions are used.
A total of 29 (26 in the
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
provided as maskable interrupts.
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.
µ
PD780131 and 780132) interrupt sources exist for maskable and software interrupts (see
CHAPTER 17 INTERRUPT FUNCTIONS
User’s Manual U16228EJ2V0UD
µ
PD780131 and 780132) internal interrupt requests are