SM1126 View Datasheet(PDF) - Nippon Precision Circuits

Part Name

Description

Manufacturer

SM1126

Melody IC with Built-in SRAM

Nippon Precision Circuits  

SM1126 Series

Write command

The SRAM write command (11011111), shown below, is used to invoke write mode.

PLAY mode changed to WRITE mode

SIO

1

1

0

1

1

1

1

1

Address set to tempo-word register

SC

ST

Figure 10. Write command timing

Tempo word

The tempo word controls the melody playback speed. The tempo word comprises a fixed code (000) fol-

lowed by the tempo code (T4 to T0), as shown below. The tempo word is always the first word written after

invoking write mode, and all subsequent words are melody data words.

SIO

WRITE command

0 0 0 T4 T3 T2 T1 T0

SC

Changed to WRITE mode

ST

write Tempo-word

ADDRESS

No Address

Tempo Register Address

Figure 11. Tempo word timing

RAM Address

NIPPON PRECISION CIRCUITS—11

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