Cirrus Logic EP93xx - Manual (Page 548)

14-26 DS785UM1
Copyright 2007 Cirrus Logic
UART1 With HDLC and Modem Control Signals
EP93xx User’s Guide
1
4
1
4
14
Default:
0x0000_0000
Definition:
Modem Control Register
Bit Descriptions:
RSVD: Reserved. Unknown During Read.
0: Must be written as “0”.
LOOP: 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: OUT2 function. Used for internal loopback.
OUT1: OUT1 function. Used for internal loopback.
RTS: RTS output signal:
1 - RTSn pin low
0 - RTSn pin high
DTR: DTR output signal:
1 - DTRn pin low
0 - DTRn pin high
UART1ModemSts
Address:
0x808C_0104 - Read Only
Default:
0x0000_0000
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
RSVD
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
RSVD DCD RI DSR CTS DDCD TERI DDSR DCTS