How to start with ICP1 external counter clock source

Projects Programming
1

Hi all!

I want to syncronize several arduinos, for that i got an external counter clock source generator.
Now how i setup the config bits to tell to this internal counter that use the external PIN8 (ICP1) as counter source?

Prescalers issue is not for now, only i need to change the config bits to this, some functions can be disabled? de delay() and getmillis() continue working after this? 8)

Best Regards
Frank

2

ICP1 is not the clock input. It is the input capture for the timer.

If you want to use an external clock, you need to feed the signal into XTAL1. Refer to page 34 of the datasheet (http://www.atmel.com/Images/doc8161.pdf).

To tell the µprocessor to use the external clock, you need to program the CKSEL fuses to 0000. This is done with avrdude.

baum