It will work fine on
12V. You do not have to split it, just supply
12V to the power connector on the
Arduino board, it will take what it needs. The only problems you may have are if the motor takes such a big current that the voltage drops too low to supply the
Arduino.
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Arduino Uno is a microcontroller board based on the ATmega328P (datasheet). It has 14 digital input/output pins (of which 6 can be used as PWM outputs), 6 analog inputs, a 16 MHz ceramic resonator (CSTCE16M0V53-R0), a USB connection, a power jack, an ICSP header and a reset button.
