at 10MHz). So is roughly 20 times faster. I/O pins are used to detect that a card is plugged in and
whether it is write protected or not.
3.5 Storage - Non-Volatile RAM (NVR)
The SAM3X8C has no internal EEPROM so some TWI (I2C) NVR is provided to hold data when
the clock is switched off and can also be used to pass information between clock faces. The
required TWI pull up resistors are here. Two, otherwise unused I/O pins, power and the TWI bus
are brought out on to a header to provide a possible route for expansion. Other TWI users are
the option jumpers and audio amplifiers, see below.
https://www.fujitsu.com/uk/Images/MB85RC04V.pdf
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