rte.md

RTE - Return from exception

Operation

IF [S] = 1 THEN
  [SR] ← [M([SP])]; [SP] ← [SP] + 2
  [PC] ← [M([SP])]; [SP] ← [SP] + 4
 ELSE TRAP

Syntax

RTE

Attributes

Unsized

Description

The status register and program counter are pulled from the stack. The previous values of the SR and PC are lost. The RTE is used to terminate an exception handler. Note that the behavior of the RTE instruction depends on the nature of both the exception and processor type. The 68010 and later models push more information on the stack following an exception than the 68000. The processor determines how much to remove from the stack.

Condition codes

X	N	Z	V	C
*	*	*	*	*

The CCR is restored to its pre-exception state.

From MOTOROLA M68000 FAMILY Programmer's reference manual. Copyright 1992 by Motorola Inc./NXP. Adapted with permission.