Using microprocessors and microcomputers: the 6800 family by William C. Wray

By William C. Wray

This version has been up to date to incorporate details at the functions of Motorola's microcontrollers - the 68HC11 family members. extra fabric additionally comprises updates on: semiconductor stories; complex assemblers for the 68000 meeting language; and the 68000 microprocessor.

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Triggering the execution of a given method describing the behavior of the called operation. 2 Signal-based messaging In UML, messages may take two forms. Either they are operation-based messages as detailed just above, or they may convey signals. A signal always models an asynchronous communication. The Signal meta-class inherits from the Classifier meta-class. Then, it can have some attributes that, in fact, represent eventually some parameters of the signalbased communication. Indeed, unlike signals in Harel’s initial statecharts concept [18], the UML signal concept can convey parameters.

This feature deals with the impact of the execution of an operation on the state of the object. If true, an execution of the operation leaves the object state unchanged. In the other, false, case, it may have side-effects on the object state. To model the side-effect possibility of an operation, the user has to put the tagged value {isQuery = ‘true or false’} after the name of the operation in the class specification. For example, the operation endRegulating of UML for Real-Time 25 Regulator class in Figure 2-5 has no side-effects on its related object features when executed.

Parallelism may be introduced either at the system level ensured by the concurrency between objects (several objects may run concurrently at a time), or also at the object level where an object may perform various things at a time. The main difficulty in using the previous described concurrency mechanisms is to use them together without contradictions. To solve such issues, each methodology dedicated to the real-time domain has to make a choice between them and to clarify some semantic rules in order that their choices may be applied coherently.

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