z84c0020 ZiLOG Semiconductor, z84c0020 Datasheet
z84c0020
Manufacturer Part Number
z84c0020
Description
Nmos/cmos Z80 Cpu Central Processing Unit
Manufacturer
ZiLOG Semiconductor
Datasheet
1.Z84C0020.pdf
(2 pages)
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FEATURES
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 third-
generation 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
Z
ILOG
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
PB006301-0301
Z8400/84C00
NMOS/CMOS Z80 CPU
C
“Exchange” instructions makes either set of main or alter-
nate registers accessible to the programmer. The alter-
nate 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 sup-
ported by an extensive family of peripheral controllers.
ENTRAL
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
P
ROCESSING
U
NIT
Z8400/84C00
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z84c0020 Summary of contents
Page 1
... NMOS Z084004 - 4 MHz Z0840006 - 6.17 MHz Z084008 - 8 MHz CMOS Z0840006 - DC to 6.17 MHz Z84C0008 - MHz Z84C0010 - MHz Z84C0020 - MHz 6 MHz Version can be Operated at 6.144 MHz Clock Speed GENERAL DESCRIPTION The Z8400/Z84C00 CPUs are fourth-generation enhanced microprocessors with exceptional computational power. ...
Page 2
Z ILOG GENERAL DESCRIPTION (Continued) Instruction Decoder +5V GND Clock CPU Timing Control 8 Systems and CPU Control Outputs Figure 1. Z8400/C00 Functional Block Diagram © 1997 by Zilog, Inc. All rights reserved. No part of this document may be ...