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ST20C2 Datasheet(PDF) 197 Page - STMicroelectronics

Part # ST20C2
Description  Instruction Set Reference Manual
PDF  212 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST20C2 Datasheet(HTML) 197 Page - STMicroelectronics

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wait
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®
wait
wait
Code: 60 F5
Description: Wait (or P) on the semaphore pointed to by Areg. If the semaphore
count is greater than zero then the count is decremented and the process continues;
otherwise the current process is descheduled and added to the back of the
semaphore list.
Definition:
if (word[Areg @ s.Count]
= 0)
{
Put process on back of semaphore list
Start next process
}
else
word
′[Areg @ s.Count] ← word[Areg @ s.Count] − 1
Areg
′← undefined
Breg
′← undefined
Creg
′← undefined
Error signals: none
Comments:
Secondary instruction.
Instruction is a descheduling point.
See also:
signal



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