Z8F021ASH020SC datasheet(210/276 Pages) ZILOG

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PS022815-0206

eZ8 CPU Instruction Set

Z8 Encore! XP® 4K Series

Product Specification

191

eZ8 CPU Instruction Set

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

(opcodes and operands) to represent the instructions themselves. The opcodes 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 following example.

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,

; Working Register R7, is the source. The contents of R7 is

; written into R4.

LD 234H, #%01

; Another Load (LD) instruction with two operands.

; The first operand, Extended Mode Register Address 234H,

; identifies the destination. The second operand, Immediate Data

; value 01H, is the source. The value 01H is written into the

; Register at address 234H.

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