TeST operand for zero

NAME
	TST -- Test operand for zero

SYNOPSIS
	TST	<ea>

	Size = (Byte, Word, Long)

FUNCTION
	Operand is compared with zero. Flags are set according to the result.

FORMAT
	-----------------------------------------------------------------
	|15 |14 |13 |12 |11 |10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
	|---|---|---|---|---|---|---|---|-------|-----------|-----------|
	| 0 | 1 | 0 | 0 | 1 | 0 | 1 | 0 | SIZE  |   MODE    |  REGISTER |
	----------------------------------------=========================
                                                          <ea>

SIZE
	00->one Byte operation
	01->one Word operation
	10->one Long operation

REGISTER
	<ea> is destination, if size is 16 or 32 bits then all addressing
	modes are allowed. If size is 8 bits, allowed addressing modes are:
	--------------------------------- -------------------------------
	|Addressing Mode|Mode| Register | |Addressing Mode|Mode|Register|
	|-------------------------------| |-----------------------------|
	|      Dn       |000 |N reg. Dn| |    Abs.W      |111 |  000   |
	|-------------------------------| |-----------------------------|
	|      An       | -  |    -     | |    Abs.L      |111 |  001   |
	|-------------------------------| |-----------------------------|
	|     (An)      |010 |N reg. An| |   (d16,PC)    |111 |  010   |
	|-------------------------------| |-----------------------------|
	|     (An)+     |011 |N reg. An| |   (d8,PC,Xi)  |111 |  011   |
	|-------------------------------| |-----------------------------|
	|    -(An)      |100 |N reg. An| |   (bd,PC,Xi)  |111 |  011   |
	|-------------------------------| |-----------------------------|
	|    (d16,An)   |101 |N reg. An| |([bd,PC,Xi],od)|111 |  011   |
	|-------------------------------| |-----------------------------|
	|   (d8,An,Xi)  |110 |N reg. An| |([bd,PC],Xi,od)|111 |  011   |
	|-------------------------------| |-----------------------------|
	|   (bd,An,Xi)  |110 |N reg. An| |    #data      | -  |   -    |
	|-------------------------------| -------------------------------
	|([bd,An,Xi]od) |110 |N reg. An|
	|-------------------------------|
	|([bd,An],Xi,od)|110 |N reg. An|
	---------------------------------

RESULT
	X - Not affected.
	N - Set if the result is negative. Cleared otherwise.
	Z - Set if the result is zero. Cleared otherwise.
	V - Always cleared.
	C - Always cleared.

SEE ALSO
	BTST	BFTST

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