SM1126 Series

NIPPON PRECISION CIRCUITS—16

Tempo

There are 29 tempos that can be selected for each melody. The tempo does not vary with the clock frequency.

Quarter note ( ) length = {1536 (32.768 kHz system) or 1800 (38.4 kHz system)}

× tempo counter frequency

divider ÷ clock frequency

(Ex. 1) Tempo code = 1F (divider = 32), clock frequency = 32.768 kHz (32.768 kHz system)

1536

× 32 ÷ 32768 = 1.5 (seconds)

(Ex. 2) Tempo code = 18 (divider = 25), CLK frequency = 153.6 kHz (38.4 kHz system)

1800

× 25 ÷ 38400 = 1.17 (seconds)

Table 5. Tempo range

Code

Frequenc y divider

Tempo

=

03

4

Prestissimo

320.0

04

5

256.0

05

6

213.3

06

7

Presto

182.9

07

8

Allegro

160.0

08

9

142.2

09

10

128.0

0A

11

Moderato

116.4

0B

12

106.7

0C

13

Andante

98.5

0D

14

91.4

0E

15

85.3

0F

16

80.0

10

17

Adagio

75.3

11

18

71.1

12

19

67.4

13

20

Larghetto

64.0

14

21

61.0

15

22

Largo

58.2

16

23

55.7

17

24

53.3

18

25

51.2

19

26

49.2

1A

27

47.4

1B

28

45.7

1C

29

44.1

1D

30

42.7

1E

31

41.3

1F

32

40.0