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Indexed addressing is presented in this module because it is necessary for implementing arrays.

Arrays can often be used to simplify programs or handle program data. It’s unusual to write a significant program without using arrays.

Program structures that correspond to C language structures are presented. These structures can be used as building blocks that implement flow charts or pseudo code.

A simple delay loop is also introduced. These are useful for short delays, but would tend to lock up a program if used for lengthy delays. Later in the course, the concept of an interrupt delay is presented.