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CHAPTER 11 INTERRUPT FUNCTIONS

User’s Manual U12978EJ3V0UD

171

11.4 Interrupt Servicing Operation

11.4.1 Non-maskable interrupt acknowledgment operation

The non-maskable interrupt is unconditionally acknowledged even when interrupts are disabled. It is not subject

to interrupt priority control and takes precedence over all other interrupts.

When the non-maskable interrupt request is acknowledged, the PSW and PC are saved to the stack in that order,

the IE flag is reset to 0, the contents of the vector table are loaded to the PC, and then program execution branches.

Caution During non-maskable interrupt service program execution, do not input another non-maskable

interrupt request; if it is input, the service program will be interrupted and the new interrupt

request will be acknowledged.

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Nec switch Bedienungsanleitung Seite 171