Circuit Cellar Ink 233
December 2009

Table of Contents


CJ Abate

HTML Task Manager

Looking Back While Moving Forward


John Gorsky

HTML New Product News


David Tweed

iMCU W7100

Embedded Networking Made Simple

The hardware TCP/IP stack of the W5100 has been enhanced in the W7100 with the the addition of an on-chip 8051 application processor core, eliminating need for a separate processor chip in many applications. Here's an introduction to the new chip and an evaluation module that's based on it.



Stephen A. Edwards

Retrocomputing on an FPGA

Reconstruct an '80s-Era Home Computer with Programmable Logic

If you're interested in preserving legacy digital electronics and integrating them with modern systems, this article is for you. Get ready to reconstruct the venerable Apple II+ with programmable logic.



Thomas Mitchell

Building Microprogrammed Machines with FPGAs

You can try microprogramming as an alternative to hardwired finite-state mcahines. Microprogrammed controllers are advantageous for numerous reasons, one of which is that FPGA implementations can be built without a finished microprogram. With this introduction to microprogramming, you're well on your way to a design that is easier to implement and maintain.


Above the Ground Plane


Ed Nisley

Memories are Not Forever

Are you having digital-related problems with a piece of bench-top equipment such as a spectrum analyzer? Some digital logic and firmware can be just the solution. Just keep in mind that something made only of bits won't last forever.


The Darker Side


Robert Lacoste

Digital Modulations Demystified

Today's blinding data transmission speeds aren't due solely to advances in processor technology. Digital modulation plays an important role, although it can be a difficult topic to understand. What is digital modulation, and how does it factor into your designs? This article introduces the subject and demystifies the complex mathematics involved in the theory.


From the Bench


Jeff Bachiochi

Extend and Isolate the I2C Bus

When you have a multiple-board application -- such as a growing robotics design -- you can use the I2C bus to move data while keeping the wiring simple. This review of the I2C communication protocol shows why the uncomplicated architecture can make a complex project a little easier.

Silicon Update


Tom Cantrell

IP Unplugged

Internet everywhere. Do you share that vision? Before you answer this question, consider 6LoWPAN, an adaptation layer between the Internet and a wireless sensor network.


Crossword Puzzle


Advertiser's Index / January Preview


Steve Ciarcia

HTML Priority Interrupt

Home Automation: Everything and Nothing

Bonus Article


Monte Dalrymple

The Evolution of Rabbits

Five Generations of Rabbit Microprocessors

How do IC designers deal with changing technology? To answer that question, let's review the evolution of a processor family over time.
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