Zilog Z8F0130 Manual do Utilizador descarregar pdf (Página 62)

eZ8

™

CPU Core

User Manual

UM012820-0810 eZ8

™

CPU Instruction Set Summary

eZ8

™

CPU Instruction Set

Summary

eZ8 CPU assembly language enables writing to an application program

without concern about actual memory addresses or machine instruction

formats. A program written in assembly language is called a source

program. Assembly language uses 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 statements. Each statement contains labels, operations,

operands and comments.

Labels are assigned to a particular instruction step in a source program.

The label identifies 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-

operations, are not translated into a machine instruction. The pseudo-

operations are interpreted as directives that control or assist the assembly

process.

The assembler processes the source program to obtain a machine

language program called the object code. The eZ8 CPU executes the

object code. An example segment of an assembly language program is

detailed in the following example.

1 2 ... 57 58 59 60 61 62 63 64 65 66 67 ... 313 314

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Zilog Z8F0130 Manual do Utilizador Página 62