Rainbow Electronics W90N745CDG User Manual
Page 291
W90N745CD/W90N745CDG
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HSUART Modem Status Register (HSUART_MSR)
REGISTER OFFSET
R/W
DESCRIPTION
RESET
VALUE
HSUART_MSR
0x18 R
MODEM Status Register (Optional)
0x0000_0000
31
30
29
28
27
26
25
24
Reserved
23
22
21
20
19
18
17
16
Reserved
15
14
13
12
11
10
9
8
Reserved
7
6
5
4
3
2
1
0
Reserved
CTS#
Reserved
DCTS
BITS
DESCRIPTIONS
[31:5]
Reserved -
[4]
CTS#
Complement version of clear to send (CTS#) input
(This bit is selected by IP)
[3:1]
Reserved -
[0]
DCTS
CTS# State Change
(This bit is selected by IP)
This bit is set whenever CTS# input has changed state, and it will be reset if
the CPU reads the MSR.
Whenever any of MSR [0] is set to logic 1, a Modem Status Interrupt is generated if IER[3]=1. Writing
MSR is a null operation (not suggested).