Datasheet

Central Processing Unit
Technical Data MC68HC912D60A — Rev. 3.1
34 Central Processing Unit Freescale Semiconductor
Table 2-1. M68HC12 Addressing Mode Summary
Addressing Mode Source Format Abbreviation Description
Inherent
INST
(no externally
supplied operands)
INH Operands (if any) are in CPU registers
Immediate
INST #opr8i
or
INST #opr16i
IMM
Operand is included in instruction stream
8- or 16-bit size implied by context
Direct INST opr8a DIR
Operand is the lower 8-bits of an address in
the range $0000 – $00FF
Extended INST opr16a EXT Operand is a 16-bit address
Relative
INST rel8
or
INST rel16
REL
An 8-bit or 16-bit relative offset from the
current pc is supplied in the instruction
Indexed
(5-bit offset)
INST oprx5,xysp IDX
5-bit signed constant offset from x, y, sp, or
pc
Indexed
(auto pre-decrement)
INST oprx3,–xys IDX Auto pre-decrement x, y, or sp by 1 ~ 8
Indexed
(auto pre-increment)
INST oprx3,+xys IDX Auto pre-increment x, y, or sp by 1 ~ 8
Indexed
(auto post-decrement)
INST oprx3,xys– IDX Auto post-decrement x, y, or sp by 1 ~ 8
Indexed
(auto post-increment)
INST oprx3,xys+ IDX Auto post-increment x, y, or sp by 1 ~ 8
Indexed
(accumulator offset)
INST abd,xysp IDX
Indexed with 8-bit (A or B) or 16-bit (D)
accumulator offset from x, y, sp, or pc
Indexed
(9-bit offset)
INST oprx9,xysp IDX1
9-bit signed constant offset from x, y, sp, or
pc
(lower 8-bits of offset in one extension byte)
Indexed
(16-bit offset)
INST oprx16,xysp IDX2
16-bit constant offset from x, y, sp, or pc
(16-bit offset in two extension bytes)
Indexed-Indirect
(16-bit offset)
INST [oprx16,xysp] [IDX2]
Pointer to operand is found at...
16-bit constant offset from x, y, sp, or pc
(16-bit offset in two extension bytes)
Indexed-Indirect
(D accumulator offset)
INST [D,xysp] [D,IDX]
Pointer to operand is found at...
x, y, sp, or pc plus the value in D