Propeller Manual

3: Assembly Language Reference – ANDN
ANDN
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.
Propeller Manual v1.1 · Page 267