Connect timer to CEN. Is it possible?

My question is wether it is possible to connect a timer to the CEN bit on CR1. What I’m trying to do is obtain a rising edge triggered pulse chain on 6 outputs, but only when a 7th timer is positive (on for 100 ms off for 900ms).

During the 100 ms, the program should trigger the pulse chain everytime it detects a leading edge, and do nothing when the 7th timer is low.

Thanks

Michael