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SM1126 Datenblatt(PDF) 6 Page - Nippon Precision Circuits Inc |
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SM1126 Datenblatt(HTML) 6 Page - Nippon Precision Circuits Inc |
6 / 18 page SM1126 Series NIPPON PRECISION CIRCUITS—6 FUNCTIONAL DESCRIPTION Control Functions External reference clock SM1126 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. SM1126 Series devices can operate at 6 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 6 selectable clock frequencies, as shown in table 1. Built-in RC oscillator versions operate at only one oscillator frequen- cies—131.072 kHz. Power-save function 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), preventing unwanted current flow. Table 1. Reference clock frequencies (external clock) Frequenc y system Selectable frequencies 32.768 kHz 32.768 kHz 65.536 kHz 131.072 kHz 38.4 kHz 38.4 kHz 76.8 kHz 153.6 kHz Figure 1. External clock input version: OSC input during playback mode only Figure 2. External clock input version: Continuous OSC input Figure 3. Built-in RC oscillator version ST OSC ST OSC ST OSC CR Oscillation |
Ähnliche Teilenummer - SM1126 |
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Ähnliche Beschreibung - SM1126 |
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