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RX4000V4 Datasheet

  • RX4000V4

  • RX4000(uITRON4.0) Basics User＇s Manual | User＇s Manual[02/...

  • 1637.71KB

  • 309頁

  • ETC

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CHAPTER 1 OVERVIEW
The RX4000 (
碌
ITRON4.0) is an embedded real-time, multitask control OS that provides a highly efficient real-time,
multitasking environment to increase the application range of processor control units. This product is a high-speed,
compact OS capable of being stored in and run from the ROM of a target system.
1.1
Real-Time OS
Control equipment demands systems that can rapidly respond to events occurring both internal and external to the
equipment. Conventional systems have utilized simple interrupt processing as a means of satisfying this demand.
With the recent improvements in the performance and functionality of control equipment, however, it has proved
difficult for systems to satisfy these requirements by means of simple interrupt processing alone.
In other words, the task of managing the order in which internal and external events are processed has become
increasingly difficult as systems have increased in complexity and programs have become ever larger.
Real-time operating systems have been designed to overcome this problem.
The main goals of a real-time OS are to respond to internal and external events rapidly and execute programs in
the optimum order.
1.2
Multitask OS
A 鈥渢ask鈥?is the minimum unit in which a program can be executed by an OS. 鈥淢ultitasking鈥?is the name given to the
mode of operation in which a single processor processes multiple tasks concurrently.
Actually, the processor can handle no more than one program (instruction) at a time. But, by switching the
processor鈥檚 attention to individual tasks on a regular basis (at a certain timing), it appears that the tasks are being
processed simultaneously.
A multitask OS therefore enables the parallel processing of tasks by switching the tasks to be executed as
determined by the system.
A major goal of a multitask OS is to improve the processing capability of the overall system through the parallel
processing of multiple tasks.
16
User鈥檚 Manual U14833EJ2V0UM

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