PC87393 datasheet(102/148 Pages) NSC

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

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6.3

MIDI PORT REGISTERS

The following abbreviations are used to indicate the Register Type:

R/W = Read/Write

R = Read from a speciﬁc address returns the value of a speciﬁc register. Write to the same address is to a different

W=Write

RO = Read Only

R/W1C = Read/Write 1 to Clear. Writing 1 to a bit clears it to 0. Writing 0 has no effect.

6.3.1

MIDI Port Register Map

The following table lists the MIDI Port registers. For the MIDI Port register bitmap, see Section 6.4.

6.3.2

MIDI Data In Register (MDI)

This read register is used for reading data received by the MIDI Port, and status information returned by the MIDI Port in

response to a previously issued command. When the FIFOs of the MIDI Port are enabled, reading from this offset returns

the next byte taken out of the Receive FIFO.

Location:

Offset 00h

Type:

6.3.3

MIDI Data Out Register (MDO)

This write register is used for writing data to be transmitted by the MIDI Port. When the FIFOs of the MIDI Port are enabled,

writing to this offset puts the data byte into the Transmit FIFO.

Location:

Offset 00h

Type:

Offset

Mnemonic

Type

Section

00h

MDI

MIDI Data In

6.3.2

00h

MDO

MIDI Data Out

6.3.3

01h

MSTAT

MIDI Status

6.3.4

01h

MCOM

MIDI Command

6.3.5

02h

MCNTL

MIDI Control

R/W

6.3.6

Bit

76543210

Name

Data In

Reset

XXXXXXXX

Bit

76543210

Name

Data Out

Reset

XXXXXXXX

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