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ST20C2 データシート(PDF) 77 Page - STMicroelectronics

部品番号 ST20C2
部品情報  Instruction Set Reference Manual
PDF  212 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST20C2 データシート(HTML) 77 Page - STMicroelectronics

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enbc
77/212
®
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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