Cs5490 – Cirrus Logic CS5490 User Manual
Page 41
CS5490
DS982F3
41
6.6.15 Chip Status 2 (Status2) – Page 0, Address 25
Default = 0x00 0000
This register indicates a variety of conditions within the chip.
[23:6]
Reserved.
QSUM_SIGN
Indicates the sign of the value contained in Q
SUM
.
0 = positive value
1 = negative value
[4]
Reserved.
Q_SIGN
Indicates the sign of the value contained in Q
AVG
.
0 = positive value
1 = negative value
PSUM_SIGN
Indicates the sign of the value contained in P
SUM
.
0 = positive value
1 = negative value
[1]
Reserved.
P_SIGN
Indicates the sign of the value contained in P
AVG
.
0 = positive value
1 = negative value
6.6.16 Line to Sample Frequency Ratio (Epsilon)
–
Page 16, Address 49
Default = 0x01 999A (0.0125 or 50Hz/4.0kHz)
Epsilon is the ratio of the input line frequency to the output word rate (OWR).
It can either be written by the application program or calculated automatically from the line frequency (from
the voltage channel input) using the AFC bit in the Config2 register. It is a two's complement value in the range
of -1.0
value 1.0, with the binary point to the right of the MSB. Negative values are not used.
23
22
21
20
19
18
17
16
-
-
-
-
-
-
-
-
15
14
13
12
11
10
9
8
-
-
-
-
-
-
-
-
7
6
5
4
3
2
1
0
-
-
QSUM_SIGN
-
Q_SIGN
PSUM_SIGN
-
P_SIGN
MSB
LSB
-(2
0
)
2
-1
2
-2
2
-3
2
-4
2
-5
2
-6
2
-7
.....
2
-17
2
-18
2
-19
2
-20
2
-21
2
-22
2
-23