sm1350 Nippon Precision Circuits Inc, (NPC), sm1350 Datasheet - Page 13

• Manufacturer Part Number: sm1350
• Description: High Tone Quality Melody Lsi
• Manufacturer: Nippon Precision Circuits Inc, (NPC)

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.
Table 1. S0, S1 resistor and melody counter
One-shot mode repeat function
In one-shot melody mode, the output repeats the same melody while STN is LOW. When STN goes HIGH, the
output continues until the end of the currently playing melody and then stops.
HIGH
HIGH
LOW
S0
Serection
Counter
HIGH
LOW
Melody
Output
S1
Melody
Output
×
STN
STN
S1
S0
Increments when melody output starts
Increments when melody output stops
Note: Refer to the "TIMING DIAGRAMS" section to confirm melody timing specifics.
Note: Refer to the "TIMING DIAGRAMS" section to confirm melody timing specifics.
#N
Melody counter
#N
No increment
Figure 11. S0, S1 melody output control timing
Figure 12. One-shot melody repeat timing
#N
#N+1
#N+1
SM1350 series
#N
#N+2
#N+2
NIPPON PRECISION CIRCUITS INC.—13
#N
#N+2
#N+2