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ST20C2 数据表(PDF) 71 Page - STMicroelectronics |
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ST20C2 数据表(HTML) 71 Page - STMicroelectronics |
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71 / 212 page  disc 71/212 ® disc 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 to 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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