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PC87366 数据表(PDF) 172 Page - National Semiconductor (TI) |
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PC87366 数据表(HTML) 172 Page - National Semiconductor (TI) |
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172 / 240 page  10.0 Musical Instrument Digital Interface (MIDI) Port (Continued) 172 www.national.com 10.2.9 Enhanced MIDI Port Features The MIDI Port supports the following modes/operations, which are not part of the Legacy definition of the MIDI Port: q Transmit in Pass-Thru q Loopback mode q MIDI Thru q MDTX pin masking Transmit in Pass-Thru. When the MIDI Port is operated in Pass-Thru mode, transmit is disabled by default. To enable it, write 1 to bit 4 of the MCNTL register. Loopback Mode. The MIDI serial data transmit signal is routed internally to the MIDI serial data receive signal. This causes all the data transmitted by the MIDI Port to also be received. Loopback mode can be used as a mode for testing the MIDI Port or its software. To enable it, write 1 to bit 7 of the MCNTL register. 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 above three features are handled by the MIDI Signals Routing Control Logic, which is illustrated in Figure 34.. Figure 34. 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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