ATmega48 controls TIL305 with custom font

Before ordering a bunch of ATtiny2313/4313 I wanted to be sure I could control the TIL305 dot matrix display. After few trial and error I chose to power each column for 4 milliseconds and multiplex per-column rather than each individual pixel. This way flickering is acceptable, even if I will probably reduce it to 3 ms as well as the current limiting resistor so to get a tad more brightness than shown in the video below. Right now I picked 1 kohm and 5 V power supply (to the uC) at the video shows the result.

Well, the overall idea and firmware does work, so I can order ATtiny4313. At least 6 of them, if I want to build a clock.