xr16m2551im48 Exar Corporation, xr16m2551im48 Datasheet - Page 33

• Manufacturer Part Number: xr16m2551im48
• Description: High Performance Low Voltage Duart With 16-byte Fifo And Powersave Feature
• Manufacturer: Exar Corporation

REV. 1.0.2
LSR[3]: Receive Data Framing Error Tag
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LSR[4]: Receive Break Error Tag
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LSR[5]: Transmit Holding Register Empty Flag
This bit is the Transmit Holding Register Empty indicator. The THR bit is set to HIGH when the last data byte is
transferred from the transmit holding register to the transmit shift register. The bit is reset to LOW concurrently
with the data loading to the transmit holding register by the host. In the FIFO mode this bit is set when the
transmit FIFO is empty, it is cleared when the transmit FIFO contains at least 1 byte.
LSR[6]: THR and TSR Empty Flag
This bit is set to HIGH whenever the transmitter goes idle. It is set to LOW whenever either the THR or TSR
contains a data character. In the FIFO mode this bit is set to HIGH whenever the transmit FIFO and transmit
shift register are both empty.
LSR[7]: Receive FIFO Data Error Flag
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This register provides the current state of the modem interface input signals. Lower four bits of this register are
used to indicate the changed information. These bits are set to HIGH whenever a signal from the modem
changes state. These bits may be used for general purpose inputs when they are not used with modem
signals.
MSR[0]: Delta CTS# Input Flag
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MSR[1]: Delta DSR# Input Flag
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MSR[2]: Delta RI# Input Flag
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4.9
Logic 0 = No framing error (default).
Logic 1 = Framing error. The receive character did not have a valid stop bit(s). This error is associated with
the character available for reading in RHR.
Logic 0 = No break condition (default).
Logic 1 = The receiver received a break signal (RX was LOW for at least one character frame time). In the
FIFO mode, only one break character is loaded into the FIFO.
Logic 0 = No FIFO error (default).
Logic 1 = A global indicator for the sum of all error bits in the RX FIFO. At least one parity error, framing error
or break indication is in the FIFO data. This bit clears when there is no more error(s) in any of the bytes in the
RX FIFO.
Logic 0 = No change on CTS# input (default).
Logic 1 = The CTS# input has changed state since the last time it was monitored. A modem status interrupt
will be generated if MSR interrupt is enabled (IER bit-3).
Logic 0 = No change on DSR# input (default).
Logic 1 = The DSR# input has changed state since the last time it was monitored. A modem status interrupt
will be generated if MSR interrupt is enabled (IER bit-3).
Logic 0 = No change on RI# input (default).
Logic 1 = The RI# input has changed from a LOW to HIGH, ending of the ringing signal. A modem status
interrupt will be generated if MSR interrupt is enabled (IER bit-3).
Modem Status Register (MSR) - Read Only
HIGH PERFORMANCE LOW VOLTAGE DUART WITH 16-BYTE FIFO AND POWERSAVE FEATURE
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XR16M2551