I have a question about ENOSC.
When the ENOSC pin set to Low ,does the OSCin clock to dividers stop??
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No, the buffer keeps going with this pin low. The basic idea of the ENOSC was that when the user used a crystal (not crystal osillator), the OSCout signal would be guaranteed to run. The reason for this is so that one could run critical microprocessors from the OSCout signal without our device being programmed. Before, you could get in the situlation where the microprocessor that programs our device waits for a clock, but our device wailts to be programmed. This is what the ENOSC pin was intended for.