added comments on mod01 ex00

module01/ex00/main.c

@@ -25,7 +25,7 @@
 #define TURN_OFF_LED(bit)			CLEAR(PORTB, bit)
 #define TOGGLE_LED(led)				TOGGLE_PIN(B, led)
 
-
+// ELEMENTS
 #define D1 0
 #define D2 1
 #define D3 2
@@ -33,6 +33,7 @@
 #define SW1 2
 #define SW2 4
 
+// TIME
 #define PRESCALE_VALUE				1024
 #if (PRESCALE_VALUE == 1)
 	#define PRESCALE_SET			(1 << CS10)
@@ -52,6 +53,8 @@ int main() {
 	TURN_OFF_LED(D2);
 
 	TCCR1B |= (PRESCALE_SET);				// set timer with prescale
+											//   -> set timer with bits CS10-12, in register TCCR1B : 16.4 Timer/Counter Clock Sources
+											//   -> prescale values : 16.11.2 TCCR1B – Timer/Counter1 Control Register B, table 16-5. Clock Select Bit Description
 
 	while(1) {
 		if ( TCNT1 >= TIME_MS(500)) {