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ST20C2 数据表(PDF) 77 Page - STMicroelectronics |
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ST20C2 数据表(HTML) 77 Page - STMicroelectronics |
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77 / 212 page  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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