LPC47M192 datasheet(80/228 Pages) SMSC

80 / 228 page

SMSC DS – LPC47M192

Page 80

Rev. 03/30/05

DATASHEET

The MPU-401 Interrupt output is active ‘1’ when the MIDI Receive Buffer Empty bit is ‘0’. The MPU-401 Interrupt

output is inactive ‘0’ when the MIDI Receive Buffer Empty bit is ‘1’. See Section “Interrupt” for more information.

Table 36 – MIDI RECEIVE BUFFER EMPTY STATUS BIT

STATUS PORT

DESCRIPTION

MIDI Read/Command Acknowledge data is

available to the host.

MIDI Read/Command Acknowledge data is

NOT available to the host.

7.7.4.2

Bit 6 – MIDI Transmit Busy

Bit 6 MIDI Transmit Busy indicates the send (write) state of the MIDI Data port and Command port (Table 37)

There are no interrupts associated with MIDI transmit (write) data.

Table 37 - MIDI TRANSMIT BUSY STATUS BIT

STATUS PORT

DESCRIPTION

The MPU-401 interface is ready to accept a

data/command byte from the host.

The MPU-401 interface is NOT ready to

accept a data/command byte from the host.

Bits[5:0]

RESERVED (Reserved bits cannot be written and return ‘0’ when read).

Command Port

The Command port is used to transfer MPU-401 commands to the Command Controller. The Command port is write-

only (Table 38). See Section “MPU-401 Command controller” below.

Table 38 - MPU-401 COMMAND PORT

MPU-401 I/O BASE ADDRESS+1

DEFAULT

TYPE

n/a

NAME

COMMAND REGISTER

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