HC705J2 datasheet(25/78 Pages) MOTOROLA

25 / 78 page

MOTOROLA

CENTRAL PROCESSOR UNIT

MC68HC705J2

4-6

4.3.2 Immediate

Immediate instructions are those that contain a value to be used in an operation

with the value in the accumulator or index register.

Immediate instructions

require no memory address and are two bytes long. The opcode is the first byte

and the immediate data value is the second byte. Table 4-2 lists the instructions

that use the immediate addressing mode.

Table 4-2. Immediate Addressing Instructions

Instruction

Mnemonic

Add with Carry

ADC

Add

ADD

Logical AND

AND

Bit Test Memory with Accumulator

BIT

Compare Accumulator with Memory

CMP

Compare Index Register with Memory

CPX

Exclusive OR Memory with Accumulator

EOR

Load Accumulator from Memory

LDA

Load Index Register from Memory

LDX

Inclusive OR

ORA

Subtract with Carry

SBC

Subtract

SUB

4.3.3 Direct

Direct instructions can access any of the first 256 memory addresses with only

two bytes. The first byte is the opcode and the second byte is the low byte of the

operand's address. In the direct addressing mode, the CPU automatically uses

$00 as the high byte of the operand's address.

BRSET and BRCLR are

three-byte instructions that use direct addressing to access the operand and

relative addressing to specify a branch destination.

Table 4-3 lists the

instructions that use the direct addressing mode.

HC705J2 Datasheet(PDF) 25 Page - Motorola, Inc

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