mcs7717 MosChip, mcs7717 Datasheet - Page 22

• Manufacturer Part Number: mcs7717
• Description: Three Port Usb Hub With 1 Serial, 1 Printer
• Manufacturer: MosChip

Page 22
MCS7717
Three Port USB Hub with 1 Serial, 1 Printer
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
011
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
Enable
3’b001
3’b011
3’b101
3’bxx0
3’b111
Bit[3]
Parity
LCR[1:0]
2’b00
2’b01
2’b10
2’b11
Data Length
5,6,7,8
6,7,8
Number of
Stop Bits
5
Bit[2]
Parity bit forced to 1
Parity bit forced to 0
Parity Type
Even parity
Odd parity
No parity
Bit[1]
Data Length
Stop Bits
Length
5 bits
6 bits
7 bits
8 bits
Data
1.5
1
2
Rev. 1.7
Bit[0]