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MICROPROCESSOR INSTRUCTION REFERENCE->TST

TST    Test an Operand

Compatibility: 68000, 68010, 68020 and CPU32 families.


Test operand and set N and Z as appropriate.


Assembler Syntax:    TST <ea>


<ea> - data alterable

Size:  Byte, Word, Long

Compares the operand with zero and sets the condition codes according to the results of the test.


Condition Codes:

N    Set if result negative, else cleared
Z    Set if result zero, else cleared
V    Always cleared
C    Always cleared
X    Not affected

    

	Allowable Addressing Modes

	<ea>,Dn	Dn,<ea>

	TST	Dn
	TST	An
	TST	(An)
	TST	(An)+
	TST	-(An)
	TST	(d16,An)
	TST	(d8,An,Xn)
	TST	(bd,An,Xn) 2
	TST	([bd,An,Xn],od) 1
	TST	([bd,An],Xn,od) 1
	TST	(xxx).W
	TST	(xxx).L
	TST	(d16,PC)
	TST	(d8,PC,Xn)
	TST	(bd,PC,Xn) 2
	TST	([bd,PC,Xn],od) 1
	TST	([bd,PC],Xn,od) 1

1   68020 only
2   68020 and CPU32 only