SCH3112I-NE SMSC [SMSC Corporation], SCH3112I-NE Datasheet - Page 97

• Manufacturer Part Number: SCH3112I-NE
• Description: LPC IO with 8042 KBC, Reset Generation, HWM and Multiple Serial Ports
• Manufacturer: SMSC [SMSC Corporation]

LPC IO with 8042 KBC, Reset Generation, HWM and Multiple Serial Ports
Datasheet
SMSC SCH311X
BIT 1
0
0
1
1
BIT 2
0
1
1
1
1
This register contains the format information of the serial line. The bit definitions are:
Bits 0 and 1
These two bits specify the number of bits in each transmitted or received serial character. The
encoding of bits 0 and 1 is as follows:
The Start, Stop and Parity bits are not included in the word length.
Bit 2
This bit specifies the number of stop bits in each transmitted or received serial character. The following
table summarizes the information.
Note: The receiver will ignore all stop bits beyond the first, regardless of the number used in
Bit 3
Parity Enable bit. When bit 3 is a logic “1”, a parity bit is generated (transmit data) or checked (receive
data) between the last data word bit and the first stop bit of the serial data. (The parity bit is used to
generate an even or odd number of 1s when the data word bits and the parity bit are summed).
Bit 4
Even Parity Select bit. When bit 3 is a logic “1” and bit 4 is a logic “0”, an odd number of logic “1”’s
is transmitted or checked in the data word bits and the parity bit. When bit 3 is a logic “1” and bit 4
is a logic “1” an even number of bits is transmitted and checked.
Bit 5
This bit is the Stick Parity bit. When parity is enabled it is used in conjunction with bit 4 to select Mark
or Space Parity. When LCR bits 3, 4 and 5 are 1 the Parity bit is transmitted and checked as a 0
(Space Parity). If bits 3 and 5 are 1 and bit 4 is a 0, then the Parity bit is transmitted and checked as
1 (Mark Parity). If bit 5 is 0 Stick Parity is disabled.
Bit 6
Set Break Control bit. When bit 6 is a logic “1”, the transmit data output (TXD) is forced to the Spacing
or logic “0” state and remains there (until reset by a low level bit 6) regardless of other transmitter
activity. This feature enables the Serial Port to alert a terminal in a communications system.
transmitting.
WORD LENGTH
--
5 bits
6 bits
7 bits
8 bits
BIT 0
0
1
0
1
DATASHEET
81
WORD LENGTH
5 Bits
6 Bits
7 Bits
8 Bits
NUMBER OF STOP BITS
1
1.5
2
2
2
Rev 0.2 (09-28-04)