SM1125_06 Datasheet, PDF (10/13 Pages) Nippon Precision Circuits Inc – Multimelody IC for Pagers

SM1125 series
Tempo
There are 29 tempos that can be selected for each melody. The tempo varies with the clock frequency.
Table 5. Tempo range
ROM
32.768kHz system
Code
Frequency
divider
Tempo
=
03
4
320.0
04
5
Prestissimo 256.0
05
6
213.3
06
7
Presto
182.9
07
8
160.0
08
9
Allegro
142.2
09
10
128.0
0A
11
116.4
Moderato
0B
12
106.7
0C
13
98.5
0D
14
91.4
Andante
0E
15
85.3
0F
16
80.0
10
17
75.3
11
18
Adagio
71.1
12
19
67.4
13
20
64.0
Larghetto
14
21
61.0
15
22
58.2
16
23
55.7
17
24
53.3
18
25
51.2
19
26
49.2
1A
27
Largo
47.4
1B
28
45.7
1C
29
44.1
1D
30
42.7
1E
31
41.3
1F
32
40.0
37.5kHz system
Tempo
=
Prestissimo
Presto
Allegro
Moderato
Andante
Adagio
Larghetto
Largo
366.2
293.0
244.1
209.3
183.1
162.8
146.5
133.2
122.1
112.7
104.6
97.7
91.6
86.2
81.4
77.1
73.2
69.8
66.6
63.7
61.0
58.6
56.3
54.3
52.3
50.5
48.8
47.3
45.8
38.4kHz system
Tempo
=
Prestissimo
Presto
Allegro
Moderato
Andante
Adagio
Larghetto
Largo
375.0
300.0
250.0
214.3
187.5
166.7
150.0
136.4
125.0
115.4
107.1
100.0
93.8
88.2
83.3
78.9
75.0
71.4
68.2
65.2
62.5
60.0
57.7
55.6
53.6
51.7
50.0
48.4
46.9
48kHz system
Tempo
=
Prestissimo
Presto
Allegro
Moderato
Andante
Adagio
Larghetto
Largo
468.8
375.0
312.5
267.9
234.4
208.3
187.5
170.5
156.3
144.2
133.9
125.0
117.2
110.3
104.2
98.7
93.8
89.3
85.2
81.5
78.1
75.0
72.1
69.4
67.0
64.7
62.5
60.5
58.6
Quarter note ( ) length = 1536 × tempo counter frequency divider ÷ clock frequency
(Ex. 1) Tempo code = 1F (divider = 32), clock frequency = 32.768kHz (32.768kHz system)
1536 × 32 ÷ 32768 = 1.5 (seconds)
(Ex. 2) Tempo code = 18 (divider = 25), CLK frequency = 153.6kHz (38.4kHz system)
1536 × 25 ÷ 38400 = 1.0 (seconds)
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