ZiLOG Z8 Technical Manual

1.1 INTRODUCTION
This chapter provides an overview of the architec-
ture and features of the ZS Family of products,
with particular emphasis on those features that
set this microcomputer apart from earlier micro-
computers. Detailed information about the archi-
tecture, address spaces and modes,
set, external interface, timing,
instruction
input/output
operations, and interrupts can be found in subse-
quent chapters of this manual.
1.2 FEATURES
The ZS microcomputer introduces a new level of
sophistication to single-chip architecture. Com-
pared to earlier single-chip microcomputers, the
ZS offers faster execution; more efficient use of
memory; more sophisticated interrupt, input/output
and bit-manipulation capabilities; and easier sys-
tem expansion.
ZS products offer the standard on-chip functions
of earlier microcomputers, including:
•
2K or 4K bytes of ROM
•
144 S-bit registers
•
32 lines of programmable I/O
•
Clock oscillator
•
Arithmetic logic unit
•
Parallel and serial ports
Beyond these basic features, the ZS Family offers
such advanced characteristics as:
• Two counter/timers
• Six vectored interrupts
• UART for serial I/O communication
• Stack functions
• Power-down option
• TTL compatibility
• Optimized instruction set
• BASIC/Debug interpreter
All members of the ZS Family are variations of the
basic ZS microcomputer, the ZS601/11. The ZS
Family includes a development device (ZS612), a
RoMless
device (ZS6S1/S2), BASIC/Debug Interpreter
(ZS671), a Protopack emulator (ZS603/D), as well
Chapter 1
Z8 Family Overview
as the basic microcomputer. These products offer
all the parts and development tools necessary for
systems development (both hardware and software
prototyping), field trials (pre-production) and
full production. For prototyping and preproduc-
tion, or where code flexibility is important, the
ZS603/13 Protopack, 2K and 4K EPROM-based parts
are the most appropriate. The ROM-based ZS601/11
microcomputers are used in high-volume production
applications after the software has been per-
fected. For RoMless applications, two versions of
the ZS microcomputer are available: the 4o-pin
ZS6S1/S2 and the 64-pin ZS612. In addition, there
is a military version of the ZS611 4K ROM device,
available in both 4o-pin ceramic and 44-pin lead-
less chip carrier packages.
The ZS671 MCU is a complete microcomputer prepro-
grammed with a BASIC/Debug Interpreter. This
device, operating with both external ROM or RAM
and on-chip memory registers, is suitable for most
industrial control applications, or whenever fast
and efficient program development is necessary.
The ZS microcomputer is well-suited for dedicated
control applications in real-t ime mode. Since
speed is a key consideration in such applications,
the ZS Family is available in both Sand 12 MHz
versions,
modules:
Z-SCAN S.
supported by either of two development
the Development Module (BM) or the
The Z-SCAN module provides (ICE) in-
circuit emulation capability.
1.2.1 Instruction Set
The ZS instruction set, consisting of 43 basic
instructions, is optimized for high-code density
and reduced execution time. The 47 instruction
types and six addressing modes--together with the
ability to operate on bits, 4-bit words, BCD
digits, S-bit bytes, and 16-bit words--make for a
code-efficient, flexible microcomputer.
1.2.2 Architecture
ZS architecture offers more flexibility and per-
formance than previous A/B accumulator designs.
All 12S general-purpose registers, including
1-1

ZiLOG Z8 Specifications

General

Brand	ZiLOG
Model	Z8
Category	Desktop
Language	English