Zilog Z8F0130 Manual do Utilizador descarregar pdf (Página 17)

100

101

eZ8

™

CPU Core

User Manual

UM012820-0810 Architectural Overview

Fetch Unit

The Fetch Unit controls the memory interface. Its primary function is to

fetch Op Codes and operands from memory. The Fetch Unit also fetches

interrupt vectors or reads and writes memory in the Program or Data

Memory.

The Fetch Unit performs a partial decoding of the Op Code to determine

the number of bytes to fetch for the operation. The Fetch Unit operation

sequence is as follows:

1. Fetch the Op Code.

2. Determine the operand size (number of bytes).

3. Fetch the operands.

Figure 1. eZ8 CPU Block Diagram

Fetch Unit

Instruction

State Machine

CPU Control

Registers

Program

Counter

Arithmetic Logic Unit

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 313 314

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