NOT: M68K instruction reference - ASM Editor

notLogical complement 
Inverts every bit of the operand at the given size.
Sizes .b .w .l, .w by default
Used in Arithmetic, logic and bitsM68K assembly
Arithmetic, logic and bitsAssembly basics
 
XNZVC –●●00
● depends on the result
0 always 0
– not changed
Forms  not   
Operands <ea> An operand using one of the addressing modes listed for this form. The list determines whether it can be a register, memory or an immediate value. With opt p=68020, an allowed d(An,Xn) or d(PC,Xn) mode also permits the corresponding 68020 indexed and memory indirect forms. See 68020 addressing. More
 * --- Bitwise complement ---
move.l #%00001111, d0
not.b d0 ; d0 low byte = %11110000

* --- Size affects which bits are flipped ---
move.l #$0000FFFF, d1
not.w d1 ; low word flipped: d1 = $00000000

move.l #$0000FFFF, d2
not.l d2 ; all bits flipped: d2 = $FFFF0000