CC_1995_i0065.pdf

THE COMPUTER APPLICATIONS JOURNAL

lthough most of us get to participate in the

beginning of projects, seldom do we get involved in

FOUNDER/EDITORIAL DIRECTOR

PUBLISHER

Steve Ciarcia

Daniel Rodrigues

v matter-publication.

I guess I’m lucky. In 1987, I was asked to add “technical editor” to my

engineering duties. With the publication then being bimonthly, I was still able

to devote much of my time to engineering. The editing part of my job pro-

vided a nice touch of spice to an otherwise engineering-only diet

As the magazine has grown to a monthly publication, my responsibili-

ties have shifted accordingly. In the last week before an issue ships, how I

almost long for an engineering-only diet! The engineering is now what keeps

me sane.

With the start of /MS Embedded PC, Circuit Cellar is opening itself up

to another adventure. What started as a quarterly insert in 1995 is already

scheduled as a bimonthly insert in 1996. Starting in February’s issue, there

will be an additional 32 pages devoted entirely to the embedded PC industry.

What changes has this brought in-house? While I stay editor-in-chief of

the magazine as a whole, Janice becomes a hybrid of technical editor for

INKand managing editor of Embedded PC. New to the ranks is Carole,

joining us as a technical editor, alleviating an overly tight workload and giving

room for growth.

The only area we remain a little tight on is the need for EPCarticles.

Embedded PC will focus on both PC software and hardware. We’ll be cover-

ing off-the-shelf motherboards, expansion boards, networking, PCI, other

buses, assemblers, compilers, debuggers, multitasking, and operating

systems. In other words, assuming your manuscript meets our readership

standards, we’ll print it. Just send your proposals in.

This issue’s Embedded PC offers a good mix of topics. Novell intro-

duces their networking expertise to the embedded PC world while Larry Fish

shows us how to get the benefits of 32-bit unsegmented architecture under

DOS and BIOS. Ken Prada covers PC/104 instruments in oceanography and

Russ overviews PC buses.

In the main issue,‘Stuarl Ball takes a close look at PLDs that can be

programmed in-circuit, along with some sample applications. David Van den

Bout shows us how to build a simple CPLD development system. Finally,

Fred Eady overviews the PIClGCxxfamily.

For our columns, Ed covers Virtual-86 interrupts from the 32-bit side,

Jeff finishes up his two-part article on a carrier current modem, and Tom

overviews the conference circuit.

EDITOR-IN-CHIEF

PUBLISHER’S ASSISTANT

Ken Davidson

Sue Hodge

EPC MANAGING EDITOR

CIRCULATION MANAGER

Janice Marinelli

Rose Mansella

TECHNICAL EDITOR

CIRCULATION ASSISTANT

Carole Boster

Barbara Maleski

ENGINEERING STAFF

CIRCULATION CONSULTANT

Jeff Bachiochi & Ed Nisley

Gregory Spitzfaden

WEST COAST EDITOR

BUSINESS MANAGER

Tom Cantrell

Jeannette Walters

CONTRIBUTING EDITORS

Rick Lehrbaum

Russ Reiss

ADVERTISING COORDINATOR

Dan Gorsky

NEW PRODUCTS EDITOR

Harv Weiner

CIRCUIT CELLAR INK”. THE COMPUTER APPLICA-

TIONS JOURNAL (ISSN 0896-6965) IS published

monthly by Clrcult Cellar Incorporated, 4 Park Street,

Sue 20. Vernon, CT 06066 (660) 675.2751. Second

classpostagepaidat Vernon, CTandaddltionaloffices.

One-year (12 issues) subscriptlon rate U.S.A. and pos-

sess1ons$21.95.CanadaiMex~co$31.95,allothercoun-

tnes $49.95 All subscription orders payable I” U.S.

funds only, wa International postal money order or

check drawn on U S bank. Direct subscription orders

and subscripton related questions to Circuit Cellar INK

ART DIRECTOR

Lisa Ferry

PRODUCTION STAFF

John Gorsky

James Soussounis

CONTRIBUTORS:

Jon Elson

Tim McDonough

Frank Kuechmann

Subscriptions, P.O. Box 696, Holmes, PA 19043.9613

01 call (&?O) 269.6301.

POSTMASTER: Please send address changes to Clr-

cu~tCellarlNK,C~rculat~on Dept.. P 0 Box696, Holmes,

PA 19043.9613.

Cover photography by Barbara Swenson

PRINTED IN THE UNITED STATES

For information on authorized reprints of articles.

contact Jeannette Walters f860) 8752199.

HAJAR ASSOCIATES NATIONAL ADVERTISING REPRESENTATIVES

NORTHEAST & SOUTHEAST MIDWEST WEST COAST

MID-ATLANTIC Christa Collins Nanette Traetow Barbara Jones

Barbara Best (305) 966-3939 (708) 357-0010 & Shelley Raine)

(908) 741-7744 Fax: (305) 985-8457 Fax: (708) 357-0452 (714) 540-3554

Fax: (908) 741-6823 Fax: (714) 540.710:

C~rcuitCellarBBS-24Hrs.300/120012400/9600/14.4kbps, 6 bits, no parity, 1 stop bit, (660)671-1966; 24001

9600 bps Courier HST, (660) 671.0549. World Wide Web: hHp:liwww.circellar.coml

All programs and schemata m QrcuitCellarlNi+have been carelully reviewed to ensure their performance

~s~naccordancewiththespeclflcatlonsdescribed,andprogramsarepostedontheClrcuitCellarBBSforelectronic

transfer by subscnbers.

CircuitCellarlN~makesnowarrantiesandassumesno responsibilityorliabllltyofanykindforerrorsinthese

programs or schematlcs or far the consequences of any such errors. Fulthermore, because of possible variation

in the quality and condttion of mater& and workmanshlp of reader-assembled protects. Circuit Cellar INP

disclaims any responslbllty for the safe and proper luncton of reader-assembled projects based upon or from

plans, descriptions, or Inform&n publlshed in Circuit Cellar INk?

Entire contents copynght 0 1995 by Clrcult Cellar Incorporated. All rlghts reserved. Clrcult Cellar INK IS a

registered trademark of Cwcu~l Cellar Inc. Reproduction of this publication in whole or m part without written

consent from Circuit Cellar Inc. IS prohiblted.

editot@circellar.com

Issue #65 December 1995

Circuit Cellar INK@

Pelletvo Kaskinen

12 In-System-Programmable PLDs from Lattice

by Stuart Ball

20 Building a Low-Cost CPLD Development System

by David Van den Bout

28 Take Your PIC

A Look at the PIC 16Cxx Family

by Fred Eady

36 7th Annual Circuit Cellar Design Contest Winners

by fanice Marinelli

74 ¦ Firmware Furnace

Journey to the Protected Land: Behind the Interrupt Curtain

Ed Nisley

84 ¦ From the Bench

Carrier Current Modem

Part 2: Alternative Control

/eff Bachiochi

92 ¦ Silicon Update

PC Times in Silicon Valley

Tom Can trell

See pages 39-73 for Our Special Bonus Section

Editor’s INK

Ken Davidson

Start Ups

I_ v

Excerpts from

the Circuit Cellar BBS

conducted by

Ken Davidson

Reader’s INK

Letters to the Editor

New Product News

edited by Harv Weiner

Steve’s Own INK

The Powers that Be

Advertiser’s Index

Circuit Cellar INK@

Issue #65 December 1995

A BETTER LEAD

Ed Lansinger’s articles on developing an engine con-

trol system really interested me, especially since I’ve

gone from having computers as a career and cars as a

hobby to the other way around.

I think readers should know about the ignition wires

my company imports to Australia from the USA. Magne-

car ignition leads are wire-wound leads with 5-20 times

more windings than other “heli” leads. They also sup-

press more RF1 and EMI.

While using these wires won’t stop your competi-

tors’ cars from bringing your ECM unglued due to RFI,

the EM1 suppression may help when your sensor wiring

goes near your plug wires. Contact:

Contacting Circuit Cellar

We at Circuit Cellar INKencourage communication between

our readers and our staff, so have made every effort to make

contacting us easy. We prefer electronic communications, but

feel free to use any of the following:

Mail: Letters to the Editor may be sent to: Editor, Circuit Cellar INK,

4 Park St., Vernon, CT 06066.

Phone: Direct all subscription inquiries to (800) 269-6301. Con-

tact our editorial offices at (860) 875-2199.

Fax: All faxes may be sent to (860) 872-2204.

BBS: All of our editors and regular authors frequent the Circuit

Cellar BBS and are available to answer questions. Call

(860) 871-1988 with your modem (300-14.4k bps, 8N1).

Internet: Letters to the editor may be sent to editor@circellar.

corn. Send new subscription orders, renewals, and ad-

dress changes to subscribeQcircellar.com. Be sure to

include your complete mailing address and return E-mail

address in all correspondence. Author E-mail addresses

(when available) may be found at the end of each article.

For more information, send E-mail to infoQcircellar.com.

WWW: Point your browser to http://www.circellar.com/.

FTP: Files are available at ftp://ftp.circellar.com/pub/circellar/.

Magnecor Australia Pty. Ltd.

2000 Oakley Park Rd., Unit IO4

Walled Lake, MI 48390

(810) 669-6688

Fax: (8 10) 669-2994

Neil Fisher

neilf Bzeta.org.au

¡ Memory mapped variables

¡ in-line assembly language

option

w Compile time switch to select

805 l/803 1 or 8052/8032 CPUs

w Compatible with any RAM

or ROM memory mapping

¡ Runs up to 50 times faster than

the MCS BASIC-52 interpreter,

¡ Includes Binary Technology’s

SXA51 cross-assembler

& hex file manip. util.

¡ Extensive documentation

m Tutorial included

¡ Runs on IBM-PC/XT or

compatibile

¡ Compatible with all 8051 variants

w BXC51$295.

508-369-9556

FAX508-369-9549

Binary Technology, Inc.

P.O. Box 541 Carlisle, MA 0 1741

WEH

Net-Port is a complete serial

data acquisition and control sys-

tern in a%cubic-inch package. The

potted Net-Port contains a variety of

digital and analog I/O along with ’

power supply regulation and commu-

nication line drivers. Net-Port requires

no programming. A simple ASCII corn-

mand protocol sets and reads all l/O.

* RS-232A. RS-422, and RS-485 at 300 bps to 1 I.5 kbas

Sixteen parallel l/O lines and IK bus

4-channel, S-bit ADC (Net-Port 5)

P-channel, Ilbit ADC and P-channel, 12.bit DAC (Net-Port E)

PWM output: 2Hz to 3.5 kHz, 595% duty cycle

* Sample ASCII command set, requires no programming!

I High-performance, built-in functions: parallel l/O bufferrng. LCD and keypad

control, analog data averaging, data logging

Sixteen-character ID allows hundreds of Net-Ports

Small see, encapsulated constructlon

Wide power supply input range

~T-~OoRf carrier board w/power supply W9.00

Yces do not include shipping

?ofures subject to change

4 Park Street Vernon, CT 06066 (860) W-6170 Fax (860) 872-2204

#103

Issue #65 December 1995

Circuit Cellar INK@

IOl~d D B ~BII~(NEW~

Edited by Harv Weiner

TARGET-CONTROLLER SOFTWARE

Stimgate releases a new productivity tool for developing por-

table software for embedded microcontroller systems. The Target

Controller for ANSI C enables software to be written in ANSI C on

the PC using well-known tools such as Borland C or Microsoft C.

Portability between processor types is ensured by Stimuli-Gateway

I/O functions that complete ANSI C with standardized I/O opera-

tions for the target microcontroller. By using files and libraries, you

can reuse code between different target platforms or C compilers.

The Stimgate Target Controller hardware connects I/O in em-

bedded target processor systems to the PC. It interfaces to the target

system by plugging into the EPROM slot and emulates the most

popular EPROM, EEPROM, and RAM devices. As with in-circuit

emulators, software for different microcontrollers and derivatives of

the same processor can be tested without additional personality

modules. Prototype software runs out of the target controller

memory, which speeds up testing and debugging over traditional

program, burn PROM, and edit cycles.

The Stimgate system has built-in hardware stimulation facili-

ties and a library of test functions for test and debugging applica-

tions. High-level messages can be sent to the PC to aid in debugging without using the UART. The Stimgate stream

windows facilitate message handling from the target system. Once the code has been proven, it can be recompiled

and ROMed for the target system using the target microcontroller compiler.

The full development system, which supports embedded controllers such as 8051, 68HCl1, 80x86, 683xx,

H8/300, H8/300H, and more, sells for $3950.

CMX Company

5 Grant St., Ste. C Framingham, MA 01701 (508) 872-7675. Fax: (508) 620-6828 E-mail: cmx@cmx.com

#SO0

FLASH MICRO PROGRAMMER

AirBorn Electronics announces a development pro-

memory. The PG205 1 erases, programs, and verifies the

grammer for the AT89C205 1 microprocessor, Model

AT89C2051 chips in 6 s.

PG2051. The AT89C205 1 is a 20-pin 805 I-compatible

The PG205 1 may be connected to a PC or other host

microprocessor [including serial port) with 2 KB of flash

by a serial cable. According to the settings on its DIP

switches, the programmer tests, erases, programs, veri-

fies, and write and security protects as it receives the

file. The unit features a test switch which enables the

user to check in just one second if the target micropro-

cessor is blank, working, programmed, or failed without

needing the PC connected.

The PG205 1 Programmer sells for $188 and in-

cludes data sheet. A complete evaluation kit is available

for $233. It includes the programmer, plug back, two

AT89C2051 devices, a small prototype board, sample

code, and a shareware assembler and disassembler.

AirBorn Electronics

19-21 Berry St., Ste. 201 P.O. Box 1491

North Sydney, NSW 2060, Australia

(61) (2) 9925-0325 Fax: (61) (2) 9925-0297

E-mail: stevenmQzeta.org.au

#SO1

Issue #65 December 1995

Circuit Cellar INK@

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