ZUSBOPTSC01ZAC datasheet(299/402 Pages) ZILOG

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PS024604-1005

P R E L I M I N A R Y

eZ8 CPU Instruction Set

Z8FMC16100 Series Flash MCU

Product Specification

277

eZ8 CPU Instruction Set

This chapter describes how to use the eZ8 CPU.

Assembly Language Programming Introduction

The eZ8 CPU assembly language provides a means for writing an application program

without concern for actual memory addresses or machine instruction formats. A program

written in assembly language is called a source program. Assembly language allows the

use of symbolic addresses to identify memory locations. It also allows mnemonic codes

(Op Codes and operands) to represent the instructions themselves. The Op Codes identify

the instruction while the operands represent memory locations, registers, or immediate

data values.

Each assembly language program consists of a series of symbolic commands called state-

ments. Each statement can contain labels, operations, operands and comments.

Labels can be assigned to a particular instruction step in a source program. The label iden-

tifies that step in the program as an entry point for use by other instructions.

The assembly language also includes assembler directives that supplement the machine

instruction. The assembler directives, or pseudo-ops, are not translated into a machine

instruction. Rather, the pseudo-ops are interpreted as directives that control or assist the

assembly process.

The source program is processed (assembled) by the assembler to obtain a machine lan-

guage program called the object code. The object code is executed by the eZ8 CPU. An

example segment of an assembly language program is detailed in the code below.

Assembly Language Source Program Example

JP START

; Everything after the semicolon is a comment.

START:

; A label called START. The first instruction (JP

START) in this

; example causes program execution to jump to the

point within the

; program where the START label occurs.

LD R4, R7

; A Load (LD) instruction with two operands. The

first operand,

; Working Register R4, is the destination. The

second operand,

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