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參數(shù)資料
| 型號： | MCS7840 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | USB-2.0 to Four Serial Ports |
| 中文描述： | 的USB 2.0 4個串行端口 |
| 文件頁數(shù)： | 15/41頁 |
| 文件大?。?/td> | 447K |
| 代理商： | MCS7840 |
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MCS7840
USB-2.0 to Four Serial Ports
Rev.
1.2
Page 15
Line Status Register (LSR):
This register provides the status of the data transfer to CPU.
Register:
Description:
Offset:
Permissions:
Access Condition:
Default Value:
LSR
Line Status Register
5
Read
0x00
Bit[7]
Data
Error
Bit[6]
Tx
Empty
Bit[5]
THR
Empty
Bit[4]
Rx
Break
Bit[3]
Framing
Error
Bit[2]
Parity
Error
Bit[1]
Overrun
Error
Bit[0]
Rx
Rdy
Bit
Description
RHR
Data Available
Operation
0
Logic 0: RHR is empty
Logic 1: RHR is not empty. Data is available to be read
Logic 0: No overrun error
Logic 1: Data was received when the RHR was full, An
overrun has occurred. The error is
fl
agged when
the data would normally have been transferred
to the RHR.
Logic 0: No parity error in normal mode or 9
th
bit received
data is “0” in 9-bit mode.
Logic 1: Data has been received that did not have correct
parity
Logic 0: No framing error
Logic 1: Data has been received with an invalid stop-bit.
Logic 0: No receiver break error
Logic 1: The receiver received a break error
Logic 0: Transmitter FIFO is not empty
Logic 1: Transmitter FIFO is empty
Logic 0: The transmitter is not idle
Logic 1: THR is empty & the transmitter has completed
the character in the shift register and is in the
idle mode
Logic 0: Either there is no receiver data error in the FIFO
or it was cleared by an earlier read of LSR
Logic 1: At least one parity error, framing error or break
indication is present in the FIFO.
1
RHR
Overrun
2
Received Data
Parity Error
3
Received Data
Framing Error
Receiver Break
Error
4
5
THR Empty
6
Transmitter &
THR Empty
7
Receiver
Data Error
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| MCS7840CV | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:USB-2.0 to Four Serial Ports |
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