is it capable to do it with a single ATmega328?
cc-type multiplexed display unit
Common Cathode - it is one way of arranging the LEDs. The other way is common anode.CC means that you put the CC to ground and power ( through a resistor ) to the segments.
8-digit 7-segment displays, including multiplexer, are <$2 on ebay.Search for "MAX7219 8-Digit".Multiple modules can be daisy-chained.Leo..