Zilog Z8F0130 Manual do Utilizador descarregar pdf (Página 16)

eZ8

™

CPU Core

User Manual

UM012820-0810 Architectural Overview

Architectural Overview

Zilog’s eZ8

™

CPU is the latest 8-bit central processing unit (CPU)

designed to meet the continuing demand for faster and more code-effi-

cient microcontrollers. The eZ8 CPU executes a superset of the original



instruction set. The features of the eZ8 CPU include:

•

Direct register-to-register architecture, which allows each register to

function as an accumulator to improve execution time and decrease

the amount of required program memory

•

A software stack that allows much greater depth in subroutine calls

and interrupts than hardware stacks

•

Compatibility with the Z8 assembly instruction set.

•

An expanded internal register file that allows access of up to 4 KB.

•

New instructions that improve execution efficiency for code devel-

oped using higher-level programming languages, including C.

•

Pipelined instruction fetch and execution

Processor Description

The eZ8 CPU consists of the following two major functional blocks:

•

Fetch Unit

•

Execution Unit

The Execution Unit is further divided into the Instruction State Machine,

Program Counter, CPU Control Registers, and Arithmetic Logic Unit

(ALU). Figure 1 displays the eZ8 CPU architecture.

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