mcs7720 MosChip, mcs7720 Datasheet - Page 11

• Manufacturer Part Number: mcs7720
• Description: Usb-1.1 To Dual Serial Ports
• Manufacturer: MosChip

Rev. 1.1
Line Control Register:
The LCR specifies the data format that is common to both transmitter and receiver.
Register:
Description:
Offset:
Permissions:
Access Condition:
LCR[1:0]: Determines the data length of serial
LCR[2]: Defines the number of stop bits per serial
LCR[5:3]: The selected parity type will be generated
LCR[6]: Transmission Break
LCR[7]: Divisor Latch Enable
Logic 0: Break transmission disabled
Logic 1: Forces the transmitter data
Logic 0: Accesses to DLL and DLM registers
Logic 1: Accesses to DLL and DLM registers
characters.
character.
during transmission and checked by the
receiver, which may produce a parity error
as a result. In 9-bit mode parity is disabled
and LCR[5:3] are ignored.
Bit[7]
DLE
output (SOUT) low to alert the
communications channel. It is the
responsibility of the software driver
to ensure that the break duration is
longer than the character period for
it to be recognized remotely as a
break rather than data.
disabled
enabled
LCR
Line Control Register
3
Read/Write
LCR[7] =0
Break
Bit[6]
Tx
Bit[5]
Force
Parity
Odd/Even
Bit[4]
Parity
LCR[2]
LCR[5:3]
0
1
1
3’b001
3’b011
3’b101
3’bxx0
3’b111
Enable
Bit[3]
Parity
LCR[1:0]
2’b00
2’b01
2’b10
2’b11
USB-1.1 to Dual Serial Ports
Data Length
5,6,7,8
6,7,8
5
Number of
Stop Bits
Bit[2]
MCS7720
Parity bit forced to 1
Parity bit forced to 0
Parity Type
Even parity
Odd parity
No parity
Data Length
Stop Bits
Bit[1]
5 bits
6 bits
7 bits
8 bits
1.5
Length
1
2
Data
Bit[0]
Page 11