Rainbow Electronics W90N740 - Manual (Page 165)

W90N740
Publication Release Date: November 26, 2004
- 161 - Revision A4
WLS [1:0]: Word Length Select
WLS[1:0] Character length
00 5 bits
01 6 bits
10 7 bits
11 8 bits
Modem Control Register (MCR)
Register Address R/W Description Reset Value
MCR 0xFFF8.0010 R/W Modem Control Register 0x0000.0000
7 6 5 4 3 2 1 0
RESERVED LBME OUT2# OUT1# RTS# DTR#
LBME [4]: Loop-back Mode Enable
0 = Disable
1 = When the loop-back mode is enabled, the following signals are connected internally:
SOUT connected to SIN and SOUT pin fixed at logic 1
DTR# connected to DSR# and DTR# pin fixed at logic 1
RTS# connected to CTS# and RTS# pin fixed at logic 1
OUT1# connected to RI# and OUT1# pin fixed at logic 1
OUT2# connected to DCD# and OUT2# pin fixed logic 1
OUT2#[3]: Complement version of OUT2# (user-designated output) signal
OUT1#[2]: Complement version of OUT1# (user-designated output) signal
RTS#[1]: Complement version of RTS# (Request-To-Send) signal
DTR#[0]: Complement version of DTR# (Data-Terminal-Ready) signal
Writing 0x00 to MCR, the DTR#, RTS#, nOUT1# and OUT2# bit are set to logic 1’s;
Writing 0x0f to MCR, the DTR#, RTS#, nOUT1# and OUT2# bit are reset to logic 0’s.