ST20C2 datasheet(162/212 Pages) STMICROELECTRONICS

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ST20C2 Datasheet(PDF) 162 Page - STMicroelectronics

Part #	ST20C2

Description	Instruction Set Reference Manual

PDF	212 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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162 / 212 page

signal

162/212

signal

Code: 60 F4

Description: Signal (or V) on the semaphore pointed to by Areg. If no process is

waiting then the count is incremented, otherwise the first process on the semaphore

list is rescheduled.

Definition:

if (word[Areg @ s.Front]

= NotProcess.p)

word

′[Areg @ s.Count] ← word[Areg @ s.Count] + 1

else

Remove the process from the front of the semaphore list and put it on the

scheduling list

Areg

′← undefined

Breg

′← undefined

Creg

← undefined

Error signals: Can cause the

Signal trap to be signalled if a process is rescheduled.

Comments:

Secondar y instruction.

Count increment is unchecked.

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