參數(shù)資料
型號(hào)： RX30000
英文描述： RX4000 Installation | User＇s Manual[10/2001]
中文描述： RX4000安裝|用戶手冊(cè)[10/2001]
文件頁(yè)數(shù)： 36/111頁(yè)
文件大小： 391K
代理商： RX30000
CHAPTER 3 SYSTEM CONSTRUCTION
User's Manual U13687EJ1V2UM
36
3.4 CREATING PROCESSING PROGRAMS
Create the processing (processing programs) required by the system.
The processing programs are classified as follows, based on their usage.
Task
Minimum unit in which processing programs can be executed under RX4000 control
Interrupt handler
An interrupt handler is a routine dedicated to interrupt processing. When the maskable interrupt occurs,
this handler is activated upon the completion of the preprocessing by RX4000 (such as saving the
contents of the registers or switching the stack) and handled independently of all other tasks. Upon the
maskable interrupt occurrence, thus, control is passed to the interrupt handler, stopping the processing of
the task being executed, even if that task has the highest priority in the system.
Cyclic handler
A cyclic handler is a routine dedicated to cyclic processing. Every time the specified time elapses, this
handler is activated immediately. This routine is handled independently of tasks. At the cyclic activation
time, thus, control is passed to the cyclic handler, stopping the processing of the task being executed,
even the task of the highest priority in the system.
A cyclic handler incurs a smaller overhead before the start of execution, relative to any other cyclic
processing programs written by the user.
Extended SVC handler
An extended SVC handler is a processing routine registered with RX4000 to call a function coded by the
user as an extended system call.
RX4000 positions the extended SVC handler as the continuation of an execution procedure from which
the extended SVC handler has been called. Therefore, if an extended SVC handler is called from a task,
it is possible to issue only those system calls that can be issued from the task. If an extended SVC
handler is called from a non-task, it is possible to issue only those system calls that can be issued from
the non-task. Pay careful attention to this point.
Signal handler
A signal handler is a routine dedicated to those tasks that process external events (signals) that occur in
individual tasks. It is regarded as an extension of the task that experiences the event, and is therefore
executed in the same context as that target task. Since the signal handler has the same priority as the
target task, the handler and the task are scheduled at the same time.
CPU exception handler
A CPU exception handler is a routine dedicated to CPU exception processing. It is activated in response
to a CPU exception.
RX4000 regards the CPU exception handler as an extension of the processing program in which the CPU
exception has occurred. Therefore, if the CPU exception handler is activated by a CPU exception that
has occurred in a task, it is possible to issue only those system calls that can be issued from the task. If
the CPU exception handler is activated by a CPU exception that has occurred in a non-task, it is possible
to issue only those system calls that can be issued from the non-task. Pay careful attention to this point.
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