Table of Contents        Previous topic       Next topic       

MICROPROCESSOR INSTRUCTION REFERENCE->TST

TST    Test an Operand


Test operand and set N and Z as appropriate.

    

Assembler Syntax:	TST <ea>
	TST.sz <ea>

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

	Dn
	An
	(An)
	(An)+
	-(An)
	(d16,An)
	(d8,An,Xn)
	(xxx).W
	(xxx).L
	(d16,PC)
	(d8,PC,Xn)