10.1: Introduction
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Now that memory has been introduced it is possible to produce machines that change state. The ability to change the state of the computer forms the basis to do calculations.
In this chapter a state machine will be presented. This machine will use memory, implemented as latches or flip-flops, to define states. Events will be generated, in this case the pushing of a button to simulate a clock pulse, which will allow the state machine to transition to a new state. The relationship between the previous and successor states will be represented in a state transition table, and the table used to encode a simple program into a multiplexer. The program to be implemented is a simple mod 4, or 2-bit, up counter, which will count from 0..3.