Counters

Abstract

Sequential logic devices which increment, decrement, and otherwise manipulate and retain a count of something are called, simply, counters. In this chapter we’ll look at several counters and see what uses different count sequences may have beyond simply keeping track of how many of something there are. Also, perhaps most importantly, this chapter will introduce a sequential logic design paradigm that we’ll use throughout the rest of the book to design systems based on registers. From sequence detectors to computer control units, this process is going to allow us to design the most critical infrastructure in our most interesting systems. For that reason alone, it’s a good idea to make sure you work through this chapter. As a bonus, we’ve got some interesting and important counters lined up for you. Enjoy!