Datasheet

Chapter 10 XGATE (S12XGATEV3)
MC9S12XE-Family Reference Manual Rev. 1.25
Freescale Semiconductor 383
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