Started following some tutorial on att85 usi. Downloaded example code from make avr book.

Make AVR Examples/Chapter11_Driving-Servo-Motors/servoSundial/_servoClockFunctions.h

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+
+
+#include "servoSundial.h"
+// Note: Global variables (ticks, seconds, minutes, hours)
+// are declared in servoSundial.h 
+// and defined in servoSundial.c
+
+// Realtime-clock handling functions
+
+// This sets up the interrupt clock
+void initTimer0_Clock(void); 
+
+// These functions are called periodically
+// to update the global time variables
+// They cascade when needed (second -> minute)
+void everySecond(void); 
+void everyMinute(void); 
+void everyHour(void);