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31:5 000 0000h Reserved
40
2
Clear to Send (CTS): This bit is the complement of the Clear to Send (CTS#) input.
This bit is equivalent to bit RTS of the Modem Control register when LOOP in the
MCR is set to 1.
0 = CTS# pin is 1
1 = CTS# pin is 0
3:1 000
2
Reserved
00
2
Delta Clear To Send (DCTS):
0 = No change in CTS# pin since last read of MSR
1 = CTS# pin has changed state