SM1350 series

NIPPON PRECISION CIRCUITS—12

Level hold melody output (LH = HIGH)

S0, S1 melody output control

The melody selection in serial mode is controlled by S0 and S1 as shown in the following table. When S1 is

HIGH, S0 switches to a pull-up input configuration. The states of S0 and S1 are read in immediately after start-

up and does not change during melody output.

Note: Refer to the "TIMING DIAGRAMS" section to confirm melody timing specifics

Figure 10. Level hold mode (serial select)

STN

#N

#N+1

#N+1

Melody

Output

Table 1. S0, S1 resistor and melody counter

S 0

S 1

Melod y counter

LOW

×

Increments when melody output stops

HIGH

LOW

No increment

HIGH

HIGH

Increments when melody output starts

Note: Refer to the "TIMING DIAGRAMS" section to confirm melody timing specifics

Figure 11. S0, S1 melody output control timing

STN

S1

S0

#N

#N+1

#N+2

#N+2

Serection

Counter

Melody

Output

#N

#N+1

#N+2

#N+2