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| 型号： | PC87393F-VJG |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 外设及接口 |
| 英文描述： | 100-Pin LPC SuperI/O Devices for Portable Applications |
| 中文描述： | MULTIFUNCTION PERIPHERAL, PQFP100 |
| 封装： | TQFP-100 |
| 文件页数： | 6/148页 |
| 文件大小： | 1733K |
| 代理商： | PC87393F-VJG |
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6.0 Musical Instrument Digital Interface (MIDI) Port (Continued)
103
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6.3.4
MIDI Status Register (MSTAT)
This read register provides status information regarding the functional blocks of the MIDI Port.
Location:
Offset 01h
Type:
R
6.3.5
MIDI Command Register (MCOM)
This write register is a port via which commands are issued by the host to the MIDI Port.
Location:
Offset 01h
Type:
W
Bit
76543210
Name
Rx Buffer
Empty
Tx Buffer
Full
Rx FIFO
Full
MIDI Port
Operation
Mode
Rx Overrun
Error
Tx FIFO Not
Empty
Reserved
Reset
10000000
Bit
Description
7
Rx Buffer Empty. When set to 1, it indicates that the Receive Buffer in Pass-Thru mode, or the FIFO in UART
mode, is empty. When set to 0, it indicates that the Receive Buffer or FIFO contain data that can be read via the
MDI register.
0: Not empty
1: Empty (default)
6
Tx Buffer Full. When set to 1, it indicates that the Transmit Buffer or FIFO cannot accept any more data. When
set to 0, it indicates that the Transmit Buffer or FIFO can accept more data written to the MDO register.
0: Not full (default)
1: Full
5
Rx FIFO Full. When set to 1, it indicates that the Receive FIFO cannot accept any more received data bytes.
When set to 0, it indicates that the Receive FIFO can accept more received data bytes. This bit is forced to 0
when the FIFOs are disabled.
0: Not full or disabled (default)
1: Full
4
MIDI Port Operation Mode. When set to 1, it indicates that the MIDI Port is currently operating in UART mode.
When set to 0, it indicates that the MIDI Port is currently operating in Pass-Thru (non-UART) mode.
0: Pass-Thru mode (default)
1: UART mode
3
Rx Overrun Error. This bit is cleared to 0 when the MSTAT register is read. An overrun error is dened as the
state in which one or more data bytes have been received by the MIDI Port while the Receive Buffer, or FIFO,
was full.
0: No overrun error (default)
1: Overrun error
2
Tx FIFO Not Empty. This bit is forced to 0 when the FIFOs are disabled.
0: Empty or disabled (default)
1: Not empty
1-0
Reserved
Bit
76543210
Name
Command Byte
Reset
XXXXXXXX
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