Table 6-34, Modem control register (mcr), Maps and registers – Artesyn ATCA-7365 Installation and Use (May 2014) User Manual
Page 183: 7 modem control register (mcr)
Maps and Registers
ATCA-7365 Installation and Use (6806800K65M)
183
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
5
Autoflow control enable (AFE):
1: Autoflow control enabled (auto-RTS# and auto-CTS# or auto-CTS# only
enabled)
0: Autoflow control disabled
0
LPC: r/w
7:6
Reserved
0
LPC: r