UPD78F0411GA-GAM-AX Datasheet, PDF (437/564 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

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 interrupt requests, each having the same priority, are simultaneously generated, then they are
processed according to the priority of vectored interrupt servicing. For the priority order, see Table 17-1.
A standby release signal is generated and STOP and HALT modes are released.
External interrupt requests and internal interrupt requests are provided as maskable interrupts.
• μPD78F040x
External: 5, internal: 17
• μPD78F041x
External: 5, internal: 18
(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
The μPD78F040x has a total of 23 interrupt sources, and the μPD78F041x has a total of 24 interrupt sources,
including maskable interrupts and software interrupts. In addition, they also have up to four reset sources (see Table
17-1).
User’s Manual U18698EJ1V0UD
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