Chapter 12 Interrupt Functions; Interrupt Function Types; Interrupt Sources And Configuration - NEC 78K0S/KA1+ User Manual

12.1 Interrupt Function Types

There are two types of interrupts: maskable interrupts and resets.
•
Maskable interrupts
These interrupts undergo mask control. When an interrupt request occurs, the standby release signal occurs,
and if an interrupt can be acknowledged then the program corresponding to the address written in the vector
table address is executed (vector interrupt servicing). When several interrupt requests are generated at the
same time, processing takes place in the priority order of the vector interrupt servicing. For details on the
priority order, see Table 12-1.
There are nine internal sources and four external sources of maskable interrupts.
•
Reset
The CPU and SFR are returned to their initial states by the reset signal.
occurrences are shown in Table 12-1.
When a reset signal occurs, program execution starts from the programs at the addresses written in addresses
0000H and 0001H.

12.2 Interrupt Sources and Configuration

There are a total of 13 maskable interrupt sources, and up to four reset sources (see Table 12-1).
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CHAPTER 12 INTERRUPT FUNCTIONS

User's Manual U16898EJ3V0UD
The causes for reset signal