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This is the R.O.M.E.68000 Manual version 0.51.
This is an experimental version.
Copyright © 1997 by G. Mezzetti; last update: January 1, 1999.

Ordinary Instructions of the ``Control'' Class

Jump to SuBRoutine

Mnemonic:

JSBR

Operands:

A,B

Oper.	Addressing Group	Op. Use	Mult. Op.
A	jadr	a	-
B	dstadr	e	-

Instruction Key:

7C

Formal Description:

IP - @(B) --> B {save return address, relative to B};
@(A) --> IP {jump to A}.

Informal Description

This instruction is used to jump to a subroutine. The current IP, relativized, is saved in B, which, because of the mode used to address it, should lie on the top of a stack (whose stack pointer is maintained by you); then the instruction jumps to A.

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