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ST20-C1 Datasheet(PDF) 154 Page - STMicroelectronics

No. de pieza ST20-C1
Descripción Electrónicos  Instruction Set Reference Manual
PDF  205 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST20-C1 Datasheet(HTML) 154 Page - STMicroelectronics

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®
Iptr
′← word [frontptr @ pw.Iptr]
if (frontptr = backptr)
--one process on queue, so make it empty
word
′[SchedulerQptr @ q.FPtrLoc] ← NotProcess
else
--many processes, so remove first
word
′[SchedulerQptr @ q.FPtrLoc] ← word[frontptr @ pw.Link]
}
Areg
′← undefined
Breg
′← undefined
Creg
′← undefined
}
where frontptr = word[SchedulerQptr @ q.FPtrLoc]
backptr = word[SchedulerQptr @ q.BPtrLoc]
Status Register:
Global interrupt enable and timeslice enable are preserved.
Start_next_task is set when the current process is descheduled and cleared
when the new process is started. An interrupt may occur between these two
stages.
Other bits are set to the values listed above.
Comments:
Secondar y instruction.
Deschedules the current process.
This instruction must not be used in an exception handler.
See also:
dequeue enqueue run wait
Chapter 7
.



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