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Zakładka z wyszukiwarką danych komponentów |
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Zakładka z wyszukiwarką danych komponentów |
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PC87373 Arkusz danych(PDF) 135 Page - National Semiconductor (TI) |
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PC87373 Arkusz danych(HTML) 135 Page - National Semiconductor (TI) |
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135 / 174 page  11.0 Musical Instrument Digital Interface (MIDI) Port (Continued) 135 www.national.com Revision 1.1 MIDI Thru. The MIDI serial data receive signal is routed internally to the MIDI Serial Data Transmit signal. This causes any incoming stream of pulses received via the MDRX pin to be driven immediately on the MDTX pin. This feature allows the MIDI Port to be connected as a link in a chain of several MIDI devices. In parallel to routing the MIDI Receive signal to the MIDI Transmit signals, the incoming serial data is also received by the MIDI Port itself. To enable it, write 1 to bit 6 of the MCNTL register. MDTX Pin Masking. MDTX pin masking forces this pin to remain at a high level. This causes all transmit processes to occur without physically driving the serial data via the MDTX pin. Writing 1 to bit 2 of the MCNTL register enables MDTX pin mask- ing. The last three features are handled by the MIDI Signals Routing Control Logic, which is illustrated in Figure 41. Figure 41. MIDI Signals Routing Control Logic MDTX Pin MDRX Pin MIDI Transmit Signal MIDI Receive Signal Loopback Mode Enable MIDI Thru Enable MDTX Pin Masking Enable 0 0 1 1 |
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