Datasheet

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SP TOS

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SP TOS

Before After

Return From Interrupt

Interrupts

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2.2.3.2 Return From Interrupt

The interrupt handling routine terminates with the instruction:

RETI (return from an interrupt service routine)

The return from the interrupt takes 5 cycles (CPU) or 3 cycles (CPUx) to execute the following actions and

is illustrated in Figure 2-7.

1. The SR with all previous settings pops from the stack. All previous settings of GIE, CPUOFF, etc. are

now in effect, regardless of the settings used during the interrupt service routine.

2. The PC pops from the stack and begins execution at the point where it was interrupted.

Figure 2-7. Return From Interrupt

2.2.3.3 Interrupt Nesting

Interrupt nesting is enabled if the GIE bit is set inside an interrupt service routine. When interrupt nesting

is enabled, any interrupt occurring during an interrupt service routine will interrupt the routine, regardless

of the interrupt priorities.

System Resets, Interrupts, and Operating Modes SLAU144J–December 2004–Revised July 2013

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