The code for that project comes as a hex file but he sent us the C code pertaining ... 0b00000011; // Timer 1 control // Prescale - 00 - 1:1, Oscilator disabled, External Clock, Timer Enebled ...

and automatically starts a five-minute break timer. Press it again and the display goes back to clock mode, although judging by the code, doing this will cancel the timer. Inside the juicy ...