I'm trying to mesh two microcontrollers that need to sample separate data at a relatively fast rate (one at 50 samples/sec, the other at
150 samples/sec). In order to determine what events logged by one microcontroller corrospond to events logged by the second microcontroller, I'm hoping to insert some sort of reference time (not nessesarily in seconds, possibly in "counts") that they can both access in order to timestamp the data before putting it on an eeprom. I imagine this would require a parallel interface, but am not familiar with alot of options out there.What "viable" (aka relatively cheap and easy) options are there for a fast reference clock for both chips? Can I just get a 555 hitting up a counter? (Ideally, I'd like the "unit" of the timer to in the range of 1/100th of a second or less, but 1/10th is doable).
Thanks in advance! Dave