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SM1126 Datenblatt(PDF) 10 Page - Nippon Precision Circuits Inc

Teilenummer SM1126
Bauteilbeschribung  Melody IC with Built-in SRAM
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Hersteller  NPC [Nippon Precision Circuits Inc]
Direct Link  http://www.npc.co.jp/en
Logo NPC - Nippon Precision Circuits Inc

SM1126 Datenblatt(HTML) 10 Page - Nippon Precision Circuits Inc

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SM1126 Series
NIPPON PRECISION CIRCUITS—10
Write Mode Control
Write sequence
The SM1126 Series devices can accept data words written to the built-in SRAM to play any melody. The
SRAM write sequence is described below.
1. Write the SRAM write command (11011111) to invoke write mode.
2. Write the tempo word (parity check ON/OFF selectable).
3. Write all necessary melody data words (parity check ON/OFF selectable).
4. Write the melody end word (parity check ON/OFF selectable).
5. Optionally, write extra data words (these are ignored).
6. Write the end-of-write command (10111111) to return to play mode.
7. If parity check was ON, write the parity check command (01111111) to perform an error check.
The built-in SRAM can store 64 words, so all melody and end words must fit within this limit. Note that the
tempo word is not stored in SRAM, but in a separate register. Playback of melodies stored in SRAM begins
from the SRAM leading address and continues until the end word is detected, at which point playback contin-
ues again from the SRAM leading address. All data in SRAM after the end word is ignored.
Figure 9. Write control sequence
Input parity check command (01111111)
Input end-of-write command (10111111)
Write optional invalid data
Write end word
Write melody word (s)
Write tempo word
Input write command (11011111)
Input end-of-write command (10111111)
Write optional invalid data
Write end word
Write melody word (s)
Write tempo word
Input write command (11011111)
Play mode
Play mode
Example 1. Parity check selected
Example 2. Parity check not selected
Write mode


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