FEDL2215-01

1Semiconductor

ML2215

15/26

7.

Volume Setting

The volume of the AOUT pin can be adjusted by applying voltage to the V

Figure 7.1 V

Figure 7.1 shows the relationship between the V

range of 1 to 4 V. The relationship is given by the equation:

AOUT (p-p)

≅ 5 − V

When a volume is not adjusted, leave the V

8.

Music Generator

The Music Generator circuit initiates music output via the MD pin by activating a user-defined music phrase from

an external controller. The Music Generator outputs music, automatically acquiring musical notes data stored in

the Mask ROM. Acquiring the last note code where the end-bit is set to “1”, results in stopping playback.

A user can define a music phrase by entering the starting address and tempo data in the Phrase Control Table, and

codes for musical notes and the end-bit information in the User’s Data area. These data for a music phrase, based

on the score of music, can be created and entered by using an OKI’s Analyzing Tool according to coding rules and

formats described later in this document.

8.1 Tempo Data

Tempo data for a music phrase can be defined in the Phrase Control Table while preparing ROM data. Tempo

cannot be changed from an external controller.

Tempo data defines a beat and rhythm for a music phrase. Table 8.1 lists tempos (the count of quarter notes per

minute) available for user’s selection.

0

1

2

3

4

5

0

1

2345

V