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參數(shù)資料
| 型號(hào)： | RX78K4 |
| 英文描述： | 78K/IV Series Real-Time OS Fundamental | User＇s Manual[01/1997] |
| 中文描述： | 78K/IV系列實(shí)時(shí)操作系統(tǒng)的基本|用戶手冊(cè)[01/1997] |
| 文件頁(yè)數(shù)： | 10/96頁(yè) |
| 文件大?。?/td> | 265K |
| 代理商： | RX78K4 |
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1
CHAPTER 1 GENERAL
Systems in the field of control equipment are required to respond immediately to changes in external and internal
events. The conventional systems have tried to satisfy this requirement by using simple interrupt programs. As the
application systems have increasingly become high-performance and sophisticated, however, many problems that
cannot be solved only by simple interrupt programs have arisen.
In other words, as systems have increasingly become complicated and as the quantity of the programs to be
executed has increased, it has been difficult to manage the execution sequence ofthe programs.
The real-time operating system (hereafter referred to as the “real-time OS”) was developed to cope with this
problem. The real-time OS immediately respond to changes in an event and executes the optimum programs in the
optimum sequence.
1.1
Multi-task OS
The minimum unit that is executed under the management of the real-time OS is called a task. Multi-tasking is
executing two or more tasks simultaneously on one CPU.
Actually, however, the CPU can only execute one program at a time. If two or more tasks are selected and
executed alternately, for example, at fixed time intervals, however, it seems to the human eye as if these tasks are
being executed at the same time.
The tasks are executed by taking advantage of opportunities such as time intervals. An OS that has a function to
execute tasks in parallel by selecting a task at specific opportunities is called a multi-task OS. A multi-task OS is
intended to improve the overall processing ability of the system processing tasks in parallel.
1.2
RX78K/IV
The RX78K/IV is a real-time OS for embedded control applications and has been developed to supply an efficient
real-time/multi-task processing environment and to expand the application range of a targeted CPU in the control
equipment field, providing complete real-time/multi-task functions.
Because it is assumed that the RX78K/IV is embedded in the target system, it has been designed as a compact,
high execution speed OS, for implementation in ROM.
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