Computers as Components, 2nd Edition

18 CHAPTER 1 Embedded Computing

■ User interface.

■ Operations that must be performed to satisfy customer requests.

■ Background actions required to keep the system running, such as operating

the GPS receiver.

UML, a language for describing specifications, will be introduced in Section 1.3,

and we will use it to write a specification in Section 1.4. We will practice writing

specifications in each chapter as we work through example system designs. We will

also study specification techniques in more detail in Chapter 9.

1.2.3 Architecture Design

The specification does not say how the system does things, only what the system

does. Describing how the system implements ...