this LED matrix clock was programmed using Hitech C!
http://pic.hitechworld.org/ledmatrixclock.html
LCD supply 3 volts, charge pump IC for LCD glass.
4 bit mode.
3x4 LEDs matrix
RTC IC
dc/dc converter, 1.2v supply
The time is loaded at startup from the RTC.
most of the 2K program memory is used up already.