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<H2><FONT face=verdana,arial>Introduction to UML
statecharts</FONT></H2><!-- /headline --><!-- sub head --><!-- /sub head -->
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<P><FONT face=Verdana color=#003366 size=2><B>The Unified
Modeling Language (UML) uses a variety of diagrams to model
systems. In this third and final installment, statecharts are
explained.</B></FONT>
<P>The term <I>reactive</I> is applied to objects that respond
dynamically to incoming events of interest and whose behavior
is driven by the order of arrival of those events. Such
objects are usually modeled and often implemented as finite
state machines. A feature of the graphical Unified Modeling
Language (UML), called statecharts, makes modeling reactive
objects a breeze.
<P>A finite state machine (FSM) specifies the events of
interest to a reactive object, the set of states that object
may assume, and the actions (and their order of execution) in
response to incoming events in any given state. This is
crucial in many systems because the allowable sequences of
primitive behaviors may be restricted.
<P><IMG
src="Embedded_com - Introduction to UML statecharts.files/0309bcfig1.gif"
border=0><BR clear=all><B>Figure 1: Statechart example</B>
<P><FONT face=Verdana color=#003366 size=3><B>State
awareness</B></FONT><BR>Consider Figure 1, which shows a
statechart of a non-invasive blood pressure (NIBP) monitor.
This statechart specifies the various states (shown as rounded
rectangles) and the transi?? 快捷鍵說明
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