Editing Zilog Z8

{{More citations needed|date=July 2009}}

[[File:KL Zilog Z8.jpg|thumb|right|Zilog Z8 processor]]
[[File:KL Zilog Z8 Super-8.jpg|thumb|Zilog Z8 (Super-8 family)]]
[[File:Zilog Z8 02 1.jpg|thumb|A Zilog Z8-02 packaged in a [[Quad in-line package|QUIP]]]]
The '''Zilog Z8''' is a [[microcontroller]] architecture, originally introduced by [[Zilog]] in 1979. Today the line also includes the '''[[Z8 Encore!]]''', '''eZ8 Encore!''',{{NoteTag|''The "Encore!" products contains the newer eZ8 core which is 2-3 times as clock cycle efficient as the original Z8 core.''}} '''eZ8 Encore! XP''', and '''eZ8 Encore! MC''' families.

Signifying features of the architecture are up to 4,096 fast on-chip registers which may be used as accumulators, pointers, or as ordinary [[random-access memory]] (RAM). A [[16-bit]] address space for between 1&nbsp;[[kibibyte]] (KB) and 64&nbsp;KB of either [[programmable read-only memory]] (PROM, OTP), [[read-only memory]] (ROM), or [[flash memory]], are used to store code and constants, and there is a second 16-bit address space which can be used for large applications.

On chip [[peripheral]]s include [[analog-to-digital converter]] (A/D), [[Serial Peripheral Interface]] (SPI){{NoteTag|http://bitsavers.trailing-edge.com/components/zilog/z8/UM001602-0904_Z8_User_Manual_2004.pdf says SPI is only in select models. 1983 manual has no mention of an SPI: https://archive.org/details/bitsavers_zilogz8198hnicalManual_4348606}} and Inter-Integrated Circuit ([[I²C]]) channels, [[IrDA]] encoders/decoders etc. There are versions with from 8 up to 80 pins, housed in [[dual in-line package]] (PDIP), [[Quad Flat No-leads package]] (MicroLeadFrame, MLF), [[small outline integrated circuit]] (SOIC), Shrink Small-Outline Package (SSOP), and low profile [[Quad Flat Package]] (LQFP). The eZ8 Encore! series can be programmed and debugged through a single pin [[serial communication]] interface.

The basic architecture, a modified (non-strict) [[Harvard architecture]], is ''technically'' very different from the [[Zilog Z80]]. Despite this, the [[instruction set]] and [[assembly language]] [[syntax]] are quite similar to other Zilog processors: Load/store operations use the same <code>LD</code> mnemonic (no <code>MOV</code> or <code>MOVE</code>s), typifying instructions such as <code>DJNZ</code>, are the same, and so on.

An [[integrated development environment]] (IDE) named Zilog Developer's Studio (ZDS) can be downloaded from Zilog's website including an assembler. The edition of ZDS II targeting Z8 Encore! and newer derivatives also includes a free compiler claiming ANSI C89 compliance.

Primary competitors include the somewhat similar{{NoteTag|''The PIC and the 8051 are using Harvard architectures as well, but in a more rigid manner.''}} [[Microchip Technology]] [[PIC microcontroller|PIC]] family, and all [[Intel 8051]] descendants. Also more traditional ''[[von Neumann architecture]] based'' single chip [[microcontroller]]s may be regarded as competitors, such as the [[Motorola 6800]], [[Motorola 6809|6809]] based [[Motorola 68HC11]], the [[Hitachi H8]] family, and [[Z80]]-derivatives, such as [[Toshiba]] TLCS-870, to name only a few.

==Product line==
*ROMless: Models without integrated ROM
*ROM: Models with integrated ROM
*BASIC: Models with integrated BASIC interpreter and debugger in ROM
*OTP: Models with integrated [[programmable read-only memory]] (OTP ROM)
*Low Voltage: Working voltage run as low as 2V
*GP: General purpose microcontroller
*Encore!: Integrated flash-based memory
*Encore! XP: Encore! with sensors
*Encore! MC (Motor Control): Motor control applications

==Emulators==
JTCEMU is a free software ([[GNU General Public License]] (GPL) version 3) Z8 emulator written in [[Java (programming language)|Java]] for [[Linux]], [[Windows]], and [[macOS]].<ref>{{Cite web |url=http://www.jens-mueller.org/jtcemu/ |title=JTCEMU: JU+TE-Computer-Emulator |last=Müller |first=Jens |date=26 July 2011 |website=Jens Müller's homepage |access-date=2020-03-30}}</ref>

==Second sources==
<gallery caption="Zilog Z8 [[second source]]s" mode="packed">
Robotron UC8810D 004 1.jpg|VEB [[Kombinat Mikroelektronik Erfurt]] ''Karl Marx'' (MME) UC8810D (mask ROM version)
Synertek Z8 03RS 1.jpg|[[Synertek]] Z8-03RS (piggy-back EPROM version)
</gallery>

==Notes==
{{NoteFoot}}

==References==
{{Reflist}}
* Grehan, Rick (September 1994). "Processors Proliferate". ''[[Byte (magazine)|Byte]]''.

== External links ==
* {{Official website|www.zilog.com}}

{{Zilog}}
{{Microcontrollers}}

[[Category:Microcontrollers]]
[[Category:Zilog microprocessors]]