SM1124 Datasheet, PDF (9/10 Pages) Nippon Precision Circuits Inc – Multimelody IC for Pagers

SM1124 Series
Tempo
There are 29 tempos that can be selected for each
tune. The tempo varies with the external reference
frequency.
Tempo table
ROM
32.768 kHz system
Code
Frequency
divider
Te m p
=
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
37.5 kHz system
Te m p
=
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
38.4 kHz system
Te m p
=
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
48 kHz system
Te m p
=
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 ÷ CLK frequency
(Ex) Tempo code = 1F (divider = 32), CLK frequency = 32.768 kHz
1536 × 32 ÷ 32768 = 1.5 (seconds)
NIPPON PRECISION CIRCUITS—9