LPC47M112 datasheet(79/208 Pages) SMSC

79 / 208 page

Enhanced Super I/O Controller with LPC Interface

Datasheet

SMSC DS – LPC47M112

Page 79

Rev. 02/02/2005

Registers (Ports)

The run-time registers in the MPU-401 Host Interface are shown below in Table 33.

Table 33 - MPU-401 Host Interface Registers

NAME

ADDRESS

TYPE

DESCRIPTION

MIDI DATA

MPU-401 I/O Base Address

R/W

Used for MIDI transmit data,

MIDI receive data, and MPU-401

command acknowledge.

STATUS

MPU-401 I/O Base Address + 1

Used to indicate the send/receive

status of the MIDI Data port.

COMMAND

MPU-401 I/O Base Address + 1

Used for MPU-401 Commands.

MIDI Data Port

The MIDI Data port exchanges MIDI transmit and MIDI receive data between the MPU-401 UART interface and the

host. The MIDI Data port is read/write (Table 34). The MIDI Data port is also used to return the command

acknowledge byte ‘FEh’ following host writes to the COMMAND port.

The MIDI Data port is full-duplex; i.e., the transmit and receive buffers can be used simultaneously.

An interrupt is generated when either MIDI receive data or a command acknowledge is available to the host in the

MIDI Data register. See Section “Bit 7 – MIDI Receive Buffer Empty” and “Interrupt”

Table 34 - MIDI Data Port

MPU-401 I/O BASE ADDRESS

DEFAULT

TYPE

R/W

n/a

NAME

MIDI DATA/COMMAND-ACKNOWLEDGE REGISTER

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