LPC47M192-NW Standard Microsystems (SMSC), LPC47M192-NW Datasheet - Page 71
LPC47M192-NW
Manufacturer Part Number
LPC47M192-NW
Description
Manufacturer
Standard Microsystems (SMSC)
Datasheet
1.LPC47M192-NW.pdf
(228 pages)
Specifications of LPC47M192-NW
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Bit 7
This bit is permanently set to logic “0” in the 450 mode. In the FIFO mode, this bit is set to a logic “1” when there is at
least one parity error, framing error or break indication in the FIFO. This bit is cleared when the LSR is read if there
are no subsequent errors in the FIFO.
MODEM STATUS REGISTER (MSR)
Address Offset = 6H, DLAB = X, READ/WRITE
This 8 bit register provides the current state of the control lines from the MODEM (or peripheral device). In addition to
this current state information, four bits of the MODEM Status Register (MSR) provide change information. These bits
are set to logic “1” whenever a control input from the MODEM changes state. They are reset to logic “0” whenever
the MODEM Status Register is read.
Bit 0
Delta Clear To Send (DCTS). Bit 0 indicates that the nCTS input to the chip has changed state since the last time the
MSR was read.
Bit 1
Delta Data Set Ready (DDSR). Bit 1 indicates that the nDSR input has changed state since the last time the MSR
was read.
Bit 2
Trailing Edge of Ring Indicator (TERI). Bit 2 indicates that the nRI input has changed from logic “0” to logic “1”.
Bit 3
Delta Data Carrier Detect (DDCD). Bit 3 indicates that the nDCD input to the chip has changed state.
Note: Whenever bit 0, 1, 2, or 3 is set to a logic “1”, a MODEM Status Interrupt is generated.
Bit 4
This bit is the complement of the Clear To Send (nCTS) input. If bit 4 of the MCR is set to logic “1”, this bit is
equivalent to nRTS in the MCR.
Bit 5
This bit is the complement of the Data Set Ready (nDSR) input. If bit 4 of the MCR is set to logic “1”, this bit is
equivalent to DTR in the MCR.
Bit 6
This bit is the complement of the Ring Indicator (nRI) input. If bit 4 of the MCR is set to logic “1”, this bit is equivalent
to OUT1 in the MCR.
Bit 7
This bit is the complement of the Data Carrier Detect (nDCD) input. If bit 4 of the MCR is set to logic “1”, this bit is
equivalent to OUT2 in the MCR.
SMSC DS – LPC47M192
Page 71
Rev. 03/30/05
DATASHEET
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