ST20C2 datasheet(197/212 Pages) STMICROELECTRONICS

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ST20C2 데이터시트(PDF) 197 Page - STMicroelectronics

부품명	ST20C2

상세설명	Instruction Set Reference Manual

PDF	212 Pages

Scroll/Zoom	100%

제조업체	STMICROELECTRONICS [STMicroelectronics]

홈페이지	http://www.st.com

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197 / 212 page

wait

197/212

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.

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