68HC805P18 datasheet(84/111 Pages) FREESCALE

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GENERAL RELEASE SPECIFICATION

INSTRUCTION SET

MC68HC805P18

12-4

12.3 Instruction Types

The MCU instructions fall into five categories:

•

Read-Modify-Write instructions

•

Jump/Branch instructions

•

Bit Manipulation instructions

•

Control instructions

12.3.1 Register/Memory Instructions

Most of these instructions use two operands. One operand is in either the

accumulator or the index register. The CPU finds the other operand in memory.

Table 12-1 lists the register/memory instructions.

Table 12-1. Register/Memory Instructions

Instruction

Mnemonic

Add Memory Byte and Carry Bit to Accumulator

ADC

Add Memory Byte to Accumulator

ADD

AND Memory Byte with Accumulator

AND

Bit Test Accumulator

BIT

Compare Accumulator

CMP

Compare Index Register with Memory Byte

CPX

EXCLUSIVE OR Accumulator with Memory Byte

EOR

Load Accumulator with Memory Byte

LDA

Load Index Register with Memory Byte

LDX

Multiply

MUL

OR Accumulator with Memory Byte

ORA

Subtract Memory Byte and Carry Bit from Accumulator

SBC

Store Accumulator in Memory

STA

Store Index Register in Memory

STX

Subtract Memory Byte from Accumulator

SUB

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