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LPC47M112 Datasheet(PDF) 80 Page - SMSC Corporation

Part No. LPC47M112
Description  ENHANCED SUPER I/O CONTROLLER WITH LPC INTERFACE
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Maker  SMSC [SMSC Corporation]
Homepage  http://www.smsc.com
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Enhanced Super I/O Controller with LPC Interface
Datasheet
SMSC DS – LPC47M112
Page 80
Rev. 02/02/2005
16 STATUS PORT
The Status port is used to indicate the state of the transmit and receive buffers in the MIDI Data port. The Status port
is read-only (Table 35). Status port Bit 6 is MIDI Transmit Busy, Bit 7 is MIDI Receive Buffer Empty. The remaining
bits in the Status port are RESERVED.
Table 35 - MPU-401 Status Port
MPU-401 I/O BASE ADDRESS+1
D7
D6
D5
D4
D3
D2
D1
D0
DEFAULT
TYPE
R
R
R
R
R
R
R
R
0x80
BIT
NAME
MIDI RX
BUFFE
R
EMPTY
MIDI TX
BUSY
0
0
0
0
0
0
Bit 7 – MIDI Receive Buffer Empty
Bit 7 MIDI Receive Buffer Empty indicates the read state of the MIDI Data port (Table 36). If the MRBE bit is ‘0’, MIDI
Read/Command Acknowledge data is available to the host.
If the MRBE bit is ‘1’, MIDI Read/Command
Acknowledge data is NOT available to the host.
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
D7
DESCRIPTION
0
MIDI Read/Command Acknowledge data is
available to the host.
1
MIDI Read/Command Acknowledge data is
NOT available to the host.
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
D6
0
The MPU-401 interface is ready to accept a
data/command byte from the host.
1
The MPU-401 interface is NOT ready to
accept a data/command byte from the host.




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