SM1124 Datasheet, PDF (6/10 Pages) Nippon Precision Circuits Inc – Multimelody IC for Pagers

SM1124 Series
SI
#n1 Data
#n2 Data
ST
MTO
#n1 Play #n1 Play #n1 Play
#n2 Play
*: Tune plays repeatedly when ST is HIGH, and stops immediately when ST goes LOW.
Playback timing diagrams
Playback start
Playback starts 128 ± 1 SCK clock cycles after ST
goes HIGH.
Invalid
Data
Valid
Data
SI
MSB
LSB
SC
ST
CLK
Internal
Clock
MTO
Playback stop
Playback stops immediately when ST goes LOW.
The IC internal clock also stops, regardless of
whether or not there is a clock input signal on pin
CLK.
128 1 Clock
,,,,,,,,,,,,
ST
CLK
Internal
Clock
MTO _{,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,}
NIPPON PRECISION CIRCUITS—6