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ST20C2 датащи(PDF) 74 Page - STMicroelectronics

номер детали ST20C2
подробное описание детали  Instruction Set Reference Manual
PDF  212 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST20C2 датащи(HTML) 74 Page - STMicroelectronics

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dist
®
74/212
dist
disable timer
Code: 22 FE
Description: Disable a timer 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 the time after which this guard will be ready. If this is the
first ready guard then the value in Areg is stored in pw.Temp, and Areg is set to
true.
Note that this instruction should be used as part of an alternative sequence following a
taltwt instruction.
Definition:
if (Breg
= false)– boolean guard is false
Areg
′← false
else if (word[Wptr @ pw.TLink]
= TimeNotSet.p)
– no timer is ready
Areg
′← false
else if (word[Wptr @ pw.TLink]
= TimeSet.p)
a timer is ready
{
if not (word[Wptr @ pw.Time] after Creg)
– but not this one
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
Areg
′← false
Remove this process from the timer list
Breg
′← undefined
Creg
′← undefined
Error signals: none
Comments:
Secondar y instruction.
Instruction is interruptible.
Uses the pw.Temp slot in the process workspace.
See also:
altend enbt talt taltwt



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