SI3201-X-FS SILABS [Silicon Laboratories], SI3201-X-FS Datasheet - Page 85

• Manufacturer Part Number: SI3201-X-FS
• Manufacturer: SILABS [Silicon Laboratories]

4. Indirect Registers
Indirect registers are not directly mapped into memory but are accessible through the IDA and IAA registers. A
write to IDA followed by a write to IAA is interpreted as a write request to an indirect register. In this case, the
contents of IDA are written to indirect memory at the location referenced by IAA at the next indirect register update.
A write to IAA without first writing to IDA is interpreted as a read request from an indirect register. In this case, the
value located at IAA is written to IDA at the next indirect register update. Indirect registers are updated at a rate of
16 kHz. For pending indirect register transfers, IAS (direct Register 31) will be one until serviced. In addition an
interrupt, IND (Register 20), can be generated upon completion of the indirect transfer.
All values are represented in twos-complement format.
Note: The values of all indirect registers are undefined following the reset state.
4.1. Oscillators
See functional description sections of tone generation, ringing, and pulse metering for guidelines on computing
register values. All values are represented in twos-complement format.
Note: The values of all indirect registers are undefined following the reset state. Shaded areas denote bits that can be read
Addr D15
Register
Indirect
Si3230
0
1
2
3
4
5
6
13
14
15
16
17
18
19
20
21
22
26
and written but should be written to zeroes.
Register
Indirect
D14
Si3233
13
0
1
2
3
4
5
6
7
8
9
Table 30. Si3230 to Si3233 Indirect Register Cross Reference
D13
Register
Indirect
OSC1X
OSC1Y
OSC2X
OSC2Y
RNGX
RNGY
DACG
Name
OSC1
OSC2
ROFF
D12
ROFF[5:0]
Table 31. Oscillator Indirect Registers Summary
RCO
D11
Register
Indirect
Si3230
D10
27
28
29
30
31
32
33
34
35
36
37
Preliminary Rev. 0.5
D9
Register
Indirect
Si3233
OSC1X[15:0]
OSC1Y[15:0]
OSC2X[15:0]
OSC2Y[15:0]
OSC1[15:0]
OSC2[15:0]
14
15
16
17
18
19
20
21
22
23
24
D8
D7
Register
Indirect
PPT12
PPT34
PPT56
ADCG
Name
RPTP
NCLR
NRTP
LCRT
NQ12
CMH
CML
D6
D5
Register
Indirect
Si3230
100
101
102
103
104
38
39
40
41
43
99
D4
D3
Register
Indirect
Si3233
25
26
27
64
66
69
70
71
72
73
74
D2
Si3233
D1
Register
Indirect
VMIND
LCRTL
FSK0X
FSK1X
FSK01
FSK10
VCMR
Name
NQ34
NQ56
FSK0
FSK1
D0
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