Chapter 10 XGATE (S12XGATEV3)
MC9S12XE-Family Reference Manual , Rev. 1.19
Freescale Semiconductor
381
10.8.1.3
Immediate 3-Bit Wide (IMM3)
Operands for immediate mode instructions are included in the instruction stream and are fetched into the
instruction queue along with the rest of the 16 bit instruction. The ’#’ symbol is used to indicate an
immediate addressing mode operand. This address mode is used for semaphore instructions.
Examples:
CSEM
#1
; Unlock semaphore 1
SSEM
#3
; Lock Semaphore 3
10.8.1.4
Immediate 4 Bit Wide (IMM4)
The 4 bit wide immediate addressing mode is supported by all shift instructions.
RD = RD
∗
IMM4
Examples:
LSL
R4,#1
; R4 = R4 << 1; shift register R4 by 1 bit to the left
LSR
R4,#3
; R4 = R4 >> 3; shift register R4 by 3 bits to the right
10.8.1.5
Immediate 8 Bit Wide (IMM8)
The 8 bit wide immediate addressing mode is supported by four major commands (ADD, SUB, LD, CMP).
RD = RD
∗
imm8
Examples:
ADDL
R1,#1
; adds an 8 bit value to register R1
SUBL
R2,#2
; subtracts an 8 bit value from register R2
LDH
R3,#3
; loads an 8 bit immediate into the high byte of Register R3
CMPL
R4,#4
; compares the low byte of register R4 with an immediate value
10.8.1.6
Immediate 16 Bit Wide (IMM16)
The 16 bit wide immediate addressing mode is a construct to simplify assembler code. Instructions which
offer this mode are translated into two opcodes using the eight bit wide immediate addressing mode.
RD = RD
∗
IMM16
Examples:
LDW
R4,#$1234
; translated to LDL R4,#$34; LDH R4,#$12
ADD
R4,#$5678
; translated to ADDL R4,#$78; ADDH R4,#$56
10.8.1.7
Monadic Addressing (MON)
In this addressing mode only one operand is explicitly given. This operand can either be the source (
f
(RD)),
the target (RD =
f
()), or both source and target of the operation (RD =
f
(RD)).
Examples:
JAL
R1
; PC = R1, R1 = PC+2
SIF
R2
; Trigger IRQ associated with the channel number in R2.L
Because
of
an
order
from
the
United
States
International
Trade
Commission,
BGA-packaged
product
lines
and
part
numbers
indicated
here
currently
are
not
available
from
Freescale
for
import
or
sale
in
the
United
States
prior
to
September
2010:
S12XE
products
in
208
MAPBGA
packages