ST20C2 datasheet(71/212 Pages) STMICROELECTRONICS

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disable channel

Code: 22 FF

Description: Disable a channel guard in an alternative sequence. Areg is the offset

from the byte following the

altend to the start of the guarded process, Breg is the

boolean guard and Creg is a pointer to the channel. If this is the first ready guard then

the value in Areg is stored in workspace and Areg is set to

true, otherwise Areg is set

false. Note that this instruction should be used as part of an alternative sequence

following an

altwt or taltwt instruction.

Definition:

if (Breg

= false)– boolean guard is false

Areg

′← false

else if (Creg

is internal channel)

{

if (word[Creg]

= NotProcess.p)

–

guard already disabled

Areg

′← false

else if (word[Creg]

= Wdesc)

– this guard is not ready

{

word

′[Creg]

← NotProcess.p

Areg

′← false

}

else if (word[Wptr @ pw.Temp]

= NoneSelected.o)

{

– this is the first ready guard

word

′[Wptr @ pw.Temp]

← Areg

Areg

′← true

}

else

– a previous guard selected

Areg

′← false

}

else if (Creg i

s external channel)

{

Disable comms subsystem and receive status

if (

channel not ready)

– channel not waiting

Areg

′← false

else if (word[Wptr @ pw.Temp]

= NoneSelected.o)

{–

this is the first ready guard

word

′[Wptr @ pw.Temp]

← Areg

Areg

′← true

}

else

- a previous guard selected

Areg

′← false

}

Breg

′← undefined

Creg

′← undefined

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