Cirrus Logic EP93 Series User Manual page 548

UART1 With HDLC and Modem Control Signals
EP93xx User's Guide
Default:
Definition:
Bit Descriptions:
14
UART1ModemSts
31 30
15 14
Address:
Default:
14-26
0x0000_0000
Modem Control Register
RSVD:
0:
LOOP:
OUT2:
OUT1:
RTS:
DTR:
29 28 27 26
13 12 11 10
RSVD
0x808C_0104 - Read Only
0x0000_0000
Copyright 2007 Cirrus Logic
Reserved. Unknown During Read.
Must be written as "0".
Activate internal modem control loopback function. This
internal loopback only affects the hardware handshake
signals. Use the UART1Ctrl LBE bit to loopback the serial
data.
When high, modem control outputs RTSn and DTRn are
forced high (inactive), and modem control inputs are
driven by outputs:
DSR = DTR
CTS = RTS
RI2 = OUT1
DCD = OUT2
OUT2 function. Used for internal loopback.
OUT1 function. Used for internal loopback.
RTS output signal:
1 - RTSn pin low
0 - RTSn pin high
DTR output signal:
1 - DTRn pin low
0 - DTRn pin high
25 24 23 22
RSVD
9 8 7 6
DCD RI
21 20 19 18
5 4 3 2
DSR CTS DDCD TERI
17 16
1 0
DDSR DCTS
DS785UM1