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 ZILOG
Z8400/84C00
Z8400/84C00
NMOS/CMOS Z80 CPU CENTRAL PROCESSING UNIT
FEATURES
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The Extensive Instruction Set.Contains 158 Instructions, Including the 8080A Instructions Set as a Subset. Single 5 Volt Power Supply NMOS Version for Low Cost, High Performance Solutions; CMOS Version for High Performance, Low Power Designs. NMOS Z084004 - 4 MHz Z0840006 - 6.17 MHz Z084008 - 8 MHz CMOS Z0840006 - DC to 6.17 MHz Z84C0008 - DC to 8 MHz Z84C0010 - DC to 10 MHz Z84C0020 - DC to 20 MHz 6 MHz Version can be Operated at 6.144 MHz Clock Speed
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The Z80 Microprocessors and Associated Family of Peripherals can be Linked by a Vectored Interrupt System. This System can be Daisy-Chained to Allow Implementation of a Priority Interrupt Scheme. Duplicate Set of Both General-Purpose and Flag Registers Two 16-Bit Index Registers Three Modes of Maskable Interrupts: - Mode 0 - 8080A Similar - Mode 1 - Non-Z80 Environment, Location 38H - Mode 2 - Z80 Family Peripherals, Vectored Interrupts On-Chip Dynamic Memory Refresh Counter
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GENERAL DESCRIPTION
The Z8400/Z84C00 CPUs are fourth-generation enhanced microprocessors with exceptional computational power. They offer higher system throughput and more efficient memory utilization than comparable second- and thirdgeneration microprocessors. The speed offerings from 6 20 MHz suit a wide range of applications which migrate software. The internal registers contain 208 bits of read/ write memory that are accessible to the programmer. These registers include two sets of six general purpose registers which may be used individually as either 8-bit registers or as 16-bit register pairs. In addition, there are two sets of accumulator and flag registers. A group of "Exchange" instructions makes either set of main or alternate registers accessible to the programmer. The alternate set allows operation in foreground-background mode or it may be reserved for very fast interrupt response. The CPU also contains a Stack Pointer, Program Counter, two index registers, a Refresh register (counter), and an Interrupt register. The CPU is easy to incorporate into a system since it requires only a single +5V power source. All output signals are fully decoded and timed to control standard memory or peripheral circuits; the CPU is supported by an extensive family of peripheral controllers.
ZILOG
Z8400/84C00
GENERAL DESCRIPTION (Continued)
8-Bit Data Bus
Data Bus Interface
Instruction Decoder +5V GND Clock CPU Timing Control
Instruction Register
Internal Data Bus
ALU
Register Array CPU Timing
8 Systems and CPU Control Outputs
5 CPU Control Inputs
Address Logic and Buffers
16-Bit Address Bus
Figure 1. Z8400/C00 Functional Block Diagram
(c) 1997 by Zilog, Inc. All rights reserved. No part of this document may be copied or reproduced in any form or by any means without the prior written consent of Zilog, Inc. The information in this document is subject to change without notice. Devices sold by Zilog, Inc. are covered by warranty and patent indemnification provisions appearing in Zilog, Inc. Terms and Conditions of Sale only. ZILOG, INC. MAKES NO WARRANTY, EXPRESS, STATUTORY, IMPLIED OR BY DESCRIPTION, REGARDING THE INFORMATION SET FORTH HEREIN OR REGARDING THE FREEDOM OF THE DESCRIBED DEVICES FROM INTELLECTUAL PROPERTY INFRINGEMENT. ZILOG, INC. MAKES NO WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PURPOSE. Zilog, Inc. shall not be responsible for any errors that may appear in this document. Zilog, Inc. makes no commitment to update or keep current the information contained in this document.
Zilog's products are not authorized for use as critical components in life support devices or systems unless a specific written agreement pertaining to such intended use is executed between the customer and Zilog prior to use. Life support devices or systems are those which are intended for surgical implantation into the body, or which sustains life whose failure to perform, when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in significant injury to the user. Zilog, Inc. 210 East Hacienda Ave. Campbell, CA 95008-6600 Telephone (408) 370-8000 Telex 910-338-7621 FAX 408 370-8056 Internet: http://www.zilog.com


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