PC87393F datasheet(104/148 Pages) NSC

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6.0 Musical Instrument Digital Interface (MIDI) Port (Continued)

104

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6.3.6

MIDI Control Register (MCNTL)

This register controls enhanced MIDI functions.

Location:

Offset 02h

Type:

R/W

Bit

76543210

Name

Loopback

Mode

Enable

MIDI Thru

Enable

Reserved

Pass-Thru

Transmit

Enable

Rx Data

Ready

Interrupt

Enable

MDTX Pin

Masking

Enable

Tx Buffer

Empty

Interrupt

Enable

Rx FIFO

Enable for

Pass-Thru

Mode

Reset

00001001

Required

Bit

Description

Loopback Mode Enable. When enabled, the MIDI receive signal is internally connected to the MIDI transmit

signal.

0: Disabled (default)

1: Enabled

MIDI Thru Enable. When enabled, the MDRX pin is internally connected to the MDTX pin, which then reﬂects

the MIDI receive signal. When disabled, the MDTX pin is driven with data coming from the MIDI Port transmit

engine.

0: Disabled (default)

1: Enabled

Reserved. Must be 0.

Pass-Thru Transmit Enable. When enabled, data is transmitted in Pass-Thru (non-UART) mode.

0: Disabled (default)

1: Enabled

Rx Data Ready Interrupt Enable. When enabled, an interrupt request is asserted in response to a Receive

Data Ready event.

0: Disabled

1: Enabled (default)

MDTX Pin Masking Enable. When enabled, the MDTX pin is constantly driven high by the MIDI Port. When

disabled, MDTX serves as the MIDI Port transmit line.

0: Disabled (default)

1: Enabled

Tx Buffer Empty Interrupt Enable. When enabled, an interrupt request is asserted in response to a Transmit

Buffer Empty event.

0: Disabled (default)

1: Enabled

Rx FIFO Enable for Pass-Thru Mode. When this bit is set to 1, the Receive FIFO is enabled in Pass-Thru

mode. This bit is ignored in UART mode.

0: Disabled

1: Enabled (default)

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