ST20C2 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ST20C2

Instruction Set Reference Manual

STMicroelectronics 

taltwt

taltwt

timer alt wait

Code: 25 FI

Description: Wait until one of the enabled guards of a timer alternative is ready and

initialize pw.Temp for use during the disabling sequence. If the alternative has no

ready guard but may become ready due to a timer, place the process onto the timer

list.

Definition:

if (word[Wptr @ pw.State] = Ready.p)

word′[Wptr @ pw.Time] ← ClockReg[Priority]

else if (word[Wptr @ pw.Tlink] = TimeNotSet.p)

{

word′[Wptr @ pw.State] ← Waiting.p

deschedule process and wait for one of the guards to become ready

}

else if (word[Wptr @ pw.Tlink] = TimeSet.p)

{

if (ClockReg[Priority] after word[Wptr @ pw.Time]

{

word′[Wptr @ pw.State] ← Ready.p

word′[Wptr @ pw.Time] ← ClockReg[Priority]

}

else

{

word′[Wptr @ pw.Time] ← (word[Wptr @ pw.Time] + 1)

insert this process into timer list with alarm time (word[Wptr @ pw.Time] + 1)

if (no guards ready)

{

word′[Wptr @ pw.State] ← Waiting.p

deschedule process and wait for one of the guards to become ready

}

}

}

else

Undefined effect

word′[Wptr @ pw.Temp] ← NoneSelected.o

Areg′

Breg′

Creg′

← undefined

← undefined

← undefined

Error signals: none

186/212

®

Share Link: