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SM1125XXV Datenblatt(PDF) 5 Page - Nippon Precision Circuits Inc |
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SM1125XXV Datenblatt(HTML) 5 Page - Nippon Precision Circuits Inc |
5 / 13 page SM1125 series SEIKO NPC CORPORATION —5 FUNCTIONAL DESCRIPTION Control Functions Reference clock SM1125 series devices are available in external clock input versions and built-in RC oscillator versions, set by master-slice option. In the case of the built-in RC oscillator option, an external resistor and capacitor is required for the oscillator function. SM1125 series can operate at 12 selectable reference clock frequencies. All melodies playback at the fixed speed set by the reference clock frequency. External clock input versions operate at one of 12 selectable clock frequencies, as shown in table 1. Built-in RC oscillator versions operate at one of 4 selectable oscillator fre- quencies—32.768kHz, 37.5kHz, 38.4kHz (standard frequency) and 48.0kHz. In external clock input versions, the external reference clock input is used during playback mode only and is otherwise ignored. If a clock signal is input when not in playback mode (when ST is LOW), the gate circuit switches to cutoff the external reference clock signal from entering the device, preventing unwanted current flow. In built-in RC oscillator versions, the oscillator is stopped when not in playback mode (when ST is LOW), pre- venting unwanted current flow. Table 1. Reference clock frequencies Frequency system Selectable frequencies 32.768kHz 32.768kHz 65.536kHz 131.072kHz 37.5kHz 37.5kHz 75.0kHz 150.0kHz 38.4kHz 38.4kHz 76.8kHz 153.6kHz 48.0kHz 48.0kHz 96.0kHz 192.0kHz Figure 1. External clock input version: Input during playback mode only Figure 2. External clock input version: Input during non-playback mode Figure 3. Built-in RC oscillator version ST OSC ST OSC ST OSC CR Oscillator |
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