ST20CX 查看數據表（PDF） - STMicroelectronics

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ST20CX

Instruction Set Reference Manual

STMicroelectronics 

enbc

enbc

enable channel

Code: 24 F8

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

boolean guard and Breg is a pointer to the channel. Note that this instruction should

only be used as part of an alternative sequence following an alt or talt instruction.

Definition:

if (Areg ≠ false)

{

if (Breg is internal channel)

{

if (word[Breg] = NotProcess.p)

– not ready

word′[Breg] ← Wdesc

else if (word[Breg] ≠ Wdesc)

– not previously enabled

word′[Wptr @ pw.State] ← Ready.p

}

else if (Breg is external channel)

{

Request Comms Subsystem to enable external channel

and receive current status of channel

if (channel ready)

-

word′[Wptr @ pw.State] ← Ready.p

}

}

Breg′ ← Creg

Creg′ ← undefined

Error signals: none

Comments:

Secondary instruction.

See also: alt altend altwt disc talt taltwt

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