XR16M890IL32-0C-EB【PDF 41/63 页】BOARD EVAL XR16M890IL32

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XR16M890

REV. 1.0.0

UART WITH 128-BYTE FIFO AND INTEGRATED LEVEL SHIFTERS

3.10

Modem Status Register (MSR) - Read Only

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 a logic 1 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. Reading the higher four bits shows the status of the modem signals.

MSR[0]: Delta CTS# Input Flag

? 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).

MSR[1]: Delta DSR# Input Flag

? 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).

MSR[2]: Delta RI# Input Flag

? Logic 0 = No change on RI# input (default).

? Logic 1 = The RI# input has changed from LOW to HIGH, ending of the ringing signal. A modem status

interrupt will be generated if MSR interrupt is enabled (IER bit-3).

MSR[3]: Delta CD# Input Flag

? Logic 0 = No change on CD# input (default).

? Logic 1 = Indicates that the CD# 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).

41

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