am79c30a Advanced Micro Devices, am79c30a Datasheet - Page 35

• Manufacturer Part Number: am79c30a
• Description: Digital Subscriber Controller ?dsc ?circuit
• Manufacturer: Advanced Micro Devices

Secondary Tone Ringer Frequency Register (STRF), Read/Write; Address = Indirect 6EH
STRF is a Read/Write register controlling the frequency of the secondary tone ringer. Hex codes 7F and 00 are re-
served and should not be used. The coefficients are defined in Table 37.
Counter
Value
D0
3D
C7
2C
C4
1C
D2
1D
C0
4C
3F
1F
0F
A1
E8
F4
7A
1E
8F
B1
0B
E2
8E
A4
E9
3A
0E
87
43
63
58
16
05
02
01
80
40
20
10
88
71
38
47
23
91
48
74
07
03
81
60
30
98
26
93
49
Frequency
Reserved
Reserved
12000.0
9600.0
8000.0
6857.1
6000.0
5333.3
4800.0
4363.6
4000.0
3692.3
3428.6
3200.0
3000.0
2823.5
2666.7
2526.3
2400.0
2285.7
2181.8
2087.0
2000.0
1920.0
1846.2
1777.8
1714.3
1655.2
1600.0
1548.4
1500.0
1454.6
1411.8
1371.4
1333.3
1297.3
1263.2
1230.8
1200.0
1170.7
1142.9
1116.3
1090.9
1066.7
1043.5
1021.3
1000.0
979.6
960.0
941.2
923.1
905.7
888.9
872.7
857.1
842.1
(Hz)
Table 37. Frequencies for Secondary Tone Ringer
Counter
Value
AD
DB
ED
BD
9D
D4
DA
6D
D6
4D
D3
0D
C3
7C
BE
DF
AF
D7
EB
BA
5D
3B
4E
27
13
09
04
82
41
A0
50
A8
6A
B5
B6
5B
6B
35
9A
A6
69
34
1A
86
E1
F0
F8
6F
B7
F6
7B
5E
75
2E
17
8B
Am79C30A/32A Data Sheet
Frequency
727.3
716.4
705.9
695.7
685.7
676.1
666.7
657.5
648.7
640.0
631.6
623.4
615.4
607.6
600.0
592.6
585.4
578.3
571.4
564.7
558.1
551.7
545.5
539.3
533.3
527.5
521.7
516.1
510.6
505.3
500.0
494.9
489.8
484.9
480.0
475.3
470.6
466.0
461.5
457.1
452.8
448.6
444.4
440.4
436.4
432.4
428.6
424.8
421.1
417.4
413.8
410.3
406.8
403.4
400.0
396.7
(Hz)
Counter
Value
CE
CA
DC
DD
D8
6C
1B
8D
C6
3C
9E
CF
E7
9C
8C
A3
D1
B4
5A
2D
4B
A2
4A
A5
A9
2A
E5
EE
BB
6E
36
E3
F1
78
73
39
67
33
19
46
68
96
25
12
89
44
51
28
94
52
54
95
72
B9
77
37
Frequency
369.2
366.4
363.6
360.9
358.2
355.6
352.9
350.4
347.8
345.3
342.9
340.4
338.0
335.7
333.3
331.0
328.8
326.5
324.3
322.2
320.0
317.9
315.8
313.7
311.7
308.7
307.7
305.7
303.8
301.9
300.0
298.1
296.3
294.5
292.7
290.9
289.2
287.4
285.7
284.0
282.4
280.7
279.1
277.5
275.9
274.3
272.7
271.2
269.7
268.2
266.7
265.2
263.7
262.3
260.9
259.5
(Hz)
Counter
Value
FD
CB
CC
AE
AB
AA
FB
7E
BF
B3
AC
2B
8A
C5
0C
C1
E0
B8
5C
D5
EA
F5
7D
3E
9F
A7
0A
C8
F7
5F
2F
97
65
32
99
66
59
56
15
62
31
18
06
83
70
57
55
FA
4F
53
29
14
85
42
21
90
Frequency
247.4
246.2
244.9
243.7
242.4
241.2
240.0
238.8
237.6
236.5
235.3
234.2
233.0
231.9
230.8
229.7
228.6
227.5
226.4
225.4
224.3
223.3
222.2
221.2
220.2
219.2
218.2
217.2
216.2
215.3
214.3
213.3
212.4
211.5
210.5
209.6
208.7
207.8
206.9
206.0
205.1
204.3
203.4
202.5
201.7
200.8
200.0
199.2
198.4
197.5
196.7
195.9
195.1
194.3
193.6
192.8
(Hz)
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