Chapter 13 Interrupt Functions; Interrupt Function Types - NEC 78K0S/KB1+ User Manual

13.1 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 13-1.
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 13-1.
When a reset signal occurs, program execution starts from the programs at the addresses written in addresses
0000H and 0001H.
222

CHAPTER 13 INTERRUPT FUNCTIONS

User's Manual U17446EJ3V1UD
The causes for reset signal