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ST20C2 数据表(PDF) 186 Page - STMicroelectronics |
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ST20C2 数据表(HTML) 186 Page - STMicroelectronics |
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186 / 212 page ![]() taltwt ® 186/212 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 ′← undefined Breg ′← undefined Creg ′← undefined Error signals: none |
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