mcs7820 MosChip, mcs7820 Datasheet - Page 9

• Manufacturer Part Number: mcs7820
• Description: Usb-2.0 To Two Serial Ports
• Manufacturer: MosChip

Rev.
Transmitter Holding Register and Receiver Holding Register (THR and RHR):
Data is written into the bottom of the THR queue and read from the top of the RHR queue completely
asynchronously to the operation of the transmitter and 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:
Register:
Description:
Offset:
Permissions:
Access Condition:
Default Value:
1.2
Bit[7]
Bit[7]
THR
Data to be transmitted
0
Write Only
LCR[7] = 0
(unknown) – based on memory
RHR
Data to be received
0
Read Only
LCR[7] = 0
(unknown) – based on memory
Bit[6]
Bit[6]
Bit[5]
Bit[5]
Data to be transmitted
Data to be received
Bit[4]
Bit[4]
Bit[3]
Bit[3]
USB-2.0 to Two Serial Ports
Bit[2]
Bit[2]
MCS7820
Bit[1]
Bit[1]
Bit[0]
Bit[0]
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