trapv.md

TRAPV - Trap on overflow

Operation

IF V = 1 THEN:
  [SSP] ← [SSP] - 4; [M([SSP])] ← [PC];
  [SSP] ← [SSP] - 2; [M([SSP])] ← [SR];
  [PC] ← [M($01C)]
  ELSE no action

Syntax

TRAPV

Attributes

Unsized

Description

If the V-bit in the CCR is set, then initiate exception processing. The exception vector is located at address 01C₁₆. This instruction is used in arithmetic operations to call the operating system if overflow occurs.

Condition codes

X	N	Z	V	C
-	-	-	-	-

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