Datasheet

PC −6

PC −4

PC −2

PC +2

PC +4

PC +6

PC +8

PC = PCi

PCi +2

PCi +4

PCi +n−4

PCi +n−2

PCi +n

Interrupt Request

Interrupt Accepted

PC+2 is Stored

Onto Stack

RETI

Instruction Set

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3.4.6.37 RETI

RETI Return from interrupt

Syntax RETI

Operation TOS → SR

SP + 2 → SP

TOS → PC

SP + 2 → SP

Description The status register is restored to the value at the beginning of the interrupt service

routine by replacing the present SR contents with the TOS contents. The stack pointer

(SP) is incremented by two.

The program counter is restored to the value at the beginning of interrupt service. This is

the consecutive step after the interrupted program flow. Restoration is performed by

replacing the present PC contents with the TOS memory contents. The stack pointer

(SP) is incremented.

Status Bits N: Restored from system stack

Z: Restored from system stack

C: Restored from system stack

V: Restored from system stack

Mode Bits OSCOFF, CPUOFF, and GIE are restored from system stack.

Example Figure 3-14 illustrates the main program interrupt.

Figure 3-14. Main Program Interrupt

100

CPU SLAU144J–December 2004–Revised July 2013

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