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PC87373 数据表(PDF) 135 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
部件名 PC87373
功能描述  LPC SuperI/O with Glue Functions
PDF  174 Pages
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制造商  NSC [National Semiconductor (TI)]
网页  http://www.national.com
标志 NSC - National Semiconductor (TI)

PC87373 数据表(HTML) 135 Page - National Semiconductor (TI)

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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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