Artesyn Embedded Technology ATCA-7365-CE, Installation And Use Manual

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Maps and Registers
ATCA-7365-CE Installation and Use (6806800L73N )
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6.3.4.2.7 Modem Control Register (MCR)
This 8-bit register controls the interface with the modem or data set (or a peripheral device
emulating a modem).
Table 6-34 Modem Control Register (MCR)
LPC IO Address: Base + 4
Bit Description Default Access
0 Data terminal ready (DTR#) output control:
1: DTR# output in low (active) state
0: DTR# output in high state 0 LPC: r/w
1 Request to send (RTS#) output control:
1: RTS# output in low (active) state
0: RTS# output in high state 0 LPC: r/w
2 User output control signal (OUT1#):
1: OUT1# output in high state
0: OUT1# output in low state
Not supported 0 LPC: r/w
3 User output control signal (OUT2#):
1: OUT2# output in high state
0: OUT2# output in low state
Not supported 0 LPC: r/w
4 Local loop back diagnostic control
When loop back is activated: Transmitter TXD is set high. Receiver
RXD is disconnected. Output of Transmitter Shift register is
looped back into the receiver shift register input. Modem control
inputs are disconnected Modem control outputs are internally
connected to modem control inputs. Modem control outputs are
forced to the inactive (high) levels:
1: Loop back mode activated
0: Normal operation 0 LPC: r/w