Silicon Laboratories SI2493/57/34/15/04 - Manual (Page 152)

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152 Rev. 1.3
The even-numbered registers, (UA0, UA2, etc.), control the amount of time the tone is expected to be present, and
the odd-numbered registers select the amount of time the tone must not be present. The values are expressed in
10 millisecond units. For example, a cadence of on 500 ms, off 300 ms then on for 500 ms may be selected by
writing 0x0032 to UA0, 0x001E to UA1 and 0x0032 to UA2. The unused registers should be written to 0. The
default cadence setting is UA0 equal to 001Eh, and the remaining nine registers are set to zero.
Table 101 defines the SAS cadence for each supported country. The on-time is listed in bold. These data were
obtained from ITU-T Recommendation E.180 Supplement 2 (04/98).
Table 100. SAS Tone Frequency
SAS_FREQ (U9F) SAS Frequency
0x0000 440 Hz (Default)
0x0001 400 Hz
0x0002 420 Hz
0x0003 425 Hz
0x0004 480 Hz
0x0005 450 Hz
0x0006 900 Hz
0x0007 950 Hz
0x0008 523 Hz
0x0009 1400 Hz
Table 101. SAS Cadence for Supported Countries*
Country Tone Frequency (Hz) Cadence (seconds) U Registers
Angola Waiting Tone 400 1.0 – 5.0
U9F = 0x0001
UA0 = 0x0064
UA1 = 0x01F4
Anguilla Waiting Tone 440 0.5 – 10.0 – 0.5
U9F = 0x0000
UA0 = 0x0032
UA1 = 0x03E8
UA2 = 0x0032
Antigua and
Barbuda Call Waiting
Tone
480 0.6 – 10.0
U9F = 0x0004
UA0 = 0x003C
UA1 = 0x03E8
Argentine Republic Waiting Tone 425 0.4 – 0.2 – 0.4 – 4.0
U9F = 0x0003
UA0 = 0x0028
UA1 = 0x0014
UA2 = 0x0028
UA3 = 0x0190