Instruction: Bitwise AND a value with the NOT of another.

ANDN Value1, < # > Value2

Result: Value1 AND !Value2 is stored in Value1.

Value1 (d-field) is the register containing the value to bitwise AND with !Value2 and is the destination in which to write the result.
Value2 (s-field) is a register or a 9-bit literal whose value is inverted (bitwise NOT) and bitwise ANDed with Value1.

Opcode Table:

–INSTR– ZCRI –CON– –DEST– –SRC–	Z Result	C Result	Result	Clocks
011001 001i 1111 ddddddddd sssssssss	Result = 0	Parity of Result	Written	4

Concise Truth Table:

In					Out
Destination	Source	Z	C	Effects	Destination	Z	C
$F731_125A; -147,778,982	$FFFF_FFFA; -6	-	-	wz wc	$0000_0000; 0	1	0
$F731_125A; -147,778,982	$FFFF_FFF8; -8	-	-	wz wc	$0000_0002; 2	0	1
$F731_125A; -147,778,982	$FFFF_FFF0; -16	-	-	wz wc	$0000_000A; 10	0	0

Explanation

ANDN (bitwise AND NOT) performs a bitwise AND of the inverted value (bitwise NOT) of Value2 into that of Value1.

If the WZ effect is specified, the Z flag is set (1) if Value1 AND !Value2 equals zero. If the WC effect is specified, the C flag is set (1) if the result contains an odd number of high (1) bits. The result is written to Value1 unless the NR effect is specified.