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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

SKip if ``condition code''

Mnemonic:

SKcc

Operands:

A,B

Oper.	Addressing Group	Op. Use	Mult. Op.
A	sadr	d	-
B	dadr	d	-

Instruction Key:

See below.

Formal Description:

if B cc A then
   IP + 1 --> IP {skip next instruction}
end if.

Informal Description

This is not a single instruction, but rather a family of instructions all sharing the same framework: an arithmetic relation between the operands is tested, and if it is true then the next instruction is skipped. SKcc is not an actual mnemonic code: you cannot type it in the source code as it is, but you must substitute the two letters cc with other two letters which indicate the condition you want to test. Each actual mnemonic code is associated with exactly one instruction key, so that different conditions correspond to different instruction keys. The actual mnemonic codes for all members of the SKcc family are listed in the table below, together with their corresponding instruction keys; of course, the table also tells you which is the arithmetic relation that each single (actual) instruction tests.

List of all instructions of the SKcc family

For instance, the official name of the SKLT instruction is ``SKip if Less Than''; the official name of the SKLE instruction is ``SKip if Less or Equal''; and so on.

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