Instruction on multiple clock cycle

Well my counter will be the timestamp of my system. It could have been a clock as well.

Then I'll write it in the firsts pixels of my image.

I have a 16MHz clock, and my video is at 30 frames per second. At that rate I have more timestamps than I have new images, avoiding the problem of having the same timestamp for several images.

My micro-processor will pick a timestamp every time an image is refreshing.

The thing is my timestamp is serialized to be send on my slave board and then parallelized to be treated.

I need to increment my counter no every clock cycle, but every 8 clock cycles, in order to solve some parts of the problem.