參數(shù)資料
型號(hào): MCS7840CV
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(gè)串行端口
文件頁(yè)數(shù): 10/41頁(yè)
文件大?。?/td> 447K
代理商: MCS7840CV
MCS7840
USB-2.0 to Four Serial Ports
Page 10
Rev.
1.2
Transmitter Holding Register & Receiver Holding Register (THR & RHR):
Data is written into the bottom of the THR queue & read from the top of the RHR queue completely
asynchronously to the operation of the transmitter & receiver. The size of the FIFOs is dependent upon the
setting of the FCR register.
Data written to the THR when it is full, is lost. Data read from the RHR when it is empty, is invalid. The empty
and full status of the FIFOs is indicated in the Line Status Register.
Register:
Description:
Offset:
Permissions:
Access Condition:
Default Value:
THR
Data to be transmitted
0
Write Only
LCR[7] = 0
(unknown) – based on memory
Bit[7]
Bit[6]
Bit[5]
Bit[4]
Data to be transmitted
Bit[3]
Bit[2]
Bit[1]
Bit[0]
Register:
Description:
Offset:
Permissions:
Access Condition:
Default Value:
RHR
Data to be received
0
Read Only
LCR[7] = 0
(unknown) – based on memory
Bit[7]
Bit[6]
Bit[5]
Bit[4]
Data to be received
Bit[3]
Bit[2]
Bit[1]
Bit[0]
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