SM1350 View Datasheet(PDF) - Nippon Precision Circuits
Part Name
Description
MFG CO.
'SM1350' PDF : 21 Pages View PDF
SM1350 series
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.
STN
Melody
Output
#N
#N
#N
Note: Refer to the "TIMING DIAGRAMS" section to confirm melody timing specifics
Figure 12. One-shot melody repeat timing
One-shot mode perpetual repeat function
If the score ROM end code is set to the jump code,
the melody will continue to play continuously once
one-shot mode starts.
STOP pin
One-shot output mode stops when STOP goes from
HIGH to LOW. The STOP input is ignored in level
hold output mode and is also ignored in one-shot
mode when STN is LOW. Note that even when
STOP is LOW, STN has higher priority.
CT pin
A pulse in sync with selected notes or rests is output
on CT. There are 2 modes for the output pulses—
pulse mode and hold mode.
Pulse mode
In pulse mode, a 16.4 ms pulse is output when a note
or rest occurs for which the corresponding CT data
in score ROM is set to 1.
CT DATA
1
CT
1
0
1
1
0
16.4msec
Figure 13. CT pulse mode output
Hold mode
In hold mode, the output pulse inverts when a note or
rest occurs for which the corresponding CT data in
score ROM is set to 1. The output goes LOW after
the start of a melody and when jumping to the
leading note of a melody.
CT DATA
1
CT
1
0
1
1
0
Figure 14. CT hold mode output
NIPPON PRECISION CIRCUITS—13
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