Hello Unregistered ,
Originally Posted by Bill Legge Or, can the MCU run at, say 20MHz and the 32768Hz be provided to the device from another source? The I²C clock is usually supplied from a pin on the MCU. Originally Posted by Bill Legge The ratings for the other pins are not given in the spec sheet. Are they '5 Volt tolerant' ? Not likely. Always assume they are not unless explicitly stated in the datasheet.
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