LPC47B272-MS SMSC, LPC47B272-MS Datasheet - Page 70

• Manufacturer Part Number: LPC47B272-MS
• Description: IC CTRLR SUPER I/O LPC 100-QFP
• Manufacturer: SMSC

Specifications of LPC47B272-MS

• Controller Type: I/O Controller
• Interface: LPC
• Voltage - Supply: 3.3V
• Current - Supply: 15mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 100-QFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 638-1019

Registers (Ports)
The run-time registers in the MPU-401 Host Interface are shown below in Table 33.
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”
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.
TYPE
BIT
NAME
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.
SMSC LPC47B27x
MIDI DATA
STATUS
COMMAND
TYPE
NAME
REGISTER
NAME
MPU-401 I/O BASE ADDRESS+1
MIDI RX
EMPTY
BUFFE
MPU-401 I/O BASE ADDRESS
D7
R/W
MIDI DATA/COMMAND-ACKNOWLEDGE REGISTER
D7
R
R
D6
R/W
MPU-401 I/O Base Address
MPU-401 I/O Base Address + 1
MPU-401 I/O Base Address + 1
MIDI TX
TABLE 36 - MIDI RECEIVE BUFFER EMPTY STATUS BIT
BUSY
TABLE 33 - MPU-401 HOST INTERFACE REGISTERS
STATUS PORT
D7
0
1
D6
R
D5
R/W
TABLE 35 - MPU-401 STATUS PORT
ADDRESS
D5
R
0
TABLE 34 - MIDI DATA PORT
D4
R/W
DATASHEET
D4
MIDI Read/Command Acknowledge data is
available to the host.
MIDI Read/Command Acknowledge data is
NOT available to the host.
R
0
D3
R/W
- 70 -
D3
R
0
D2
R/W
R/W
R
W
DESCRIPTION
TYPE
D2
R
0
D1
R/W
Used for MIDI transmit data,
MIDI receive data, and MPU-401
command acknowledge.
Used to indicate the send/receive
status of the MIDI Data port.
Used for MPU-401 Commands.
D1
R
0
D0
R/W
DESCRIPTION
D0
R
0
DEFAULT
n/a
DEFAULT
0x80
Rev. 04-17-07