PC87373 datasheet(136/174 Pages) NSC

136 / 174 page

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

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Revision 1.1

11.3 MIDI PORT REGISTERS

The following abbreviations are used to indicate the Register Type:

R/W

= Read/Write.

= Read from register (write to the same address is to a different register).

= Write (see above).

= Read Only.

= Write Only. Reading from the bit returns 0.

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

R/W1S = Read/Write 1 to Set. Writing 1 to a bit sets its value to 1. Writing 0 has no effect.

11.3.1 MIDI Port Register Map

The following table lists the MIDI Port registers. For the MIDI Port register bitmap, see Section 11.4 on page 139. The MIDI

Port registers are VDD3 powered.

11.3.2 MIDI Data In Register (MDI)

This read register is used for reading data received by the MIDI Port and for reading 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.

Power Well: VDD3

Location:

Offset 00h

Type:

11.3.3 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.

Power Well: VDD3

Location:

Offset 00h

Type:

Table 50. MIDI Port Register Map

Offset

Mnemonic

Type

Power Well Section

00h

MDI

MIDI Data In

RVDD3

11.3.2

00h

MDO

MIDI Data Out

WVDD3

11.3.3

01h

MSTAT

MIDI Status

RVDD3

11.3.4

01h

MCOM

MIDI Command

WVDD3

11.3.5

02h

MCNTL

MIDI Control

R/W

VDD3

11.3.6

03h

Reserved

Bit

76543210

Name

Data In

Reset

XXXXXXXX

Bit

76543210

Name

Data Out

Reset

XXXXXXXX

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