The operand is in a memory location referenced by an effective
address computed by adding together the PC
a second data or address register, and a signed 8-bit displacement.
The value in the second register can either be a full long word or a sign-
extended word value. This is specified by a .W or .L extension after
the register. If no extension is used, the assembler assumes a word
The Index register can optionally be multiplied with 1 / 2 / 4 or 8
As INDEX register can be used A0 .. A7 or D0 .. D7