sm1350 Nippon Precision Circuits Inc, (NPC), sm1350 Datasheet - Page 12

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

If the “Select change retrigger [Yes]” mask option is selected, a new melody starts playing from the leading
note when any of the S0 to S3 inputs changes state.
Serial select mode (MODE = HIGH)
In serial select mode, the next melody is selected by cycling through the melodies in the order #N → #N + 1 …
#N − 1 → #N when the STN input goes LOW. The number of melodies in the cycle is set by master-slice
option. Note that when melody output is stopped using the STOP input, the melody-select counter increments.
One-shot melody output (LH = LOW)
Level hold melody output (LH = HIGH)
Figure 8. Level hold mode (binary select) with “Select change retrigger [Yes]” mask option
S0 to S3
Melody
Output
Melody
Output
Melody
Output
STN
STN
STN
Note: Refer to the "TIMING DIAGRAMS" section to confirm melody timing specifics.
Note: Refer to the "TIMING DIAGRAMS" section to confirm melody timing specifics.
Note: Refer to the "TIMING DIAGRAMS" section to confirm melody timing specifics.
Figure 10. Level hold mode (serial select)
Figure 9. One-shot mode (serial select)
#N
#N
#N
#N
SM1350 series
#N+1
#N+1
#M
#M
NIPPON PRECISION CIRCUITS INC.—12
#N+1
#N+2