FDC37M707-MS Standard Microsystems (SMSC), FDC37M707-MS Datasheet - Page 70
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FDC37M707-MS
Manufacturer Part Number
FDC37M707-MS
Description
Manufacturer
Standard Microsystems (SMSC)
Datasheet
1.FDC37M707-MS.pdf
(194 pages)
Specifications of FDC37M707-MS
Pin Count
100
Lead Free Status / RoHS Status
Compliant
- Current page: 70 of 194
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Address Offset = 3H, DLAB = 0, READ/WRITE
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:
beyond the first, regardless of the number used
in transmitting.
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 2
0
1
1
1
1
BIT 1
The receiver will ignore all stop bits
0
0
1
1
WORD LENGTH
BIT 0 WORD LENGTH
5 bits
6 bits
7 bits
8 bits
--
0
1
0
1
5 Bits
6 Bits
7 Bits
8 Bits
NUMBER OF
STOP BITS
1.5
1
2
2
2
70
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
Stick Parity bit. When bit 3 is a logic "1" and bit
5 is a logic "1", the parity bit is transmitted and
then detected by the receiver in the opposite
state indicated by bit 4.
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.
Bit 7
Divisor Latch Access bit (DLAB). It must be set
high (logic "1") to access the Divisor Latches of
the Baud Rate Generator during read or write
operations.
access the Receiver Buffer Register, the
Transmitter Holding Register, or the Interrupt
Enable Register.
MODEM CONTROL REGISTER (MCR)
Address Offset = 4H, DLAB = X, READ/WRITE
This 8 bit register controls the interface with the
MODEM or data set (or device emulating a
MODEM). The contents of the MODEM control
register are described below.
Bit 0
This bit controls the Data Terminal Ready
(nDTR) output. When bit 0 is set to a logic "1",
the nDTR output is forced to a logic "0". When
bit 0 is a logic "0", the nDTR output is forced to
a logic "1".
It must be set low (logic "0") to
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