Greetings, I've used and external 4MHz clock to synchronize 4 pca9685 s, and would now like to do the same with the pca9956B. The 9685 has an EXTCLK pin, a selection bit in MODE1, and even a prescaler to divide the clock down if desired. I see a reference to external clocking in the 9956's datasheet (section 7.4), but no pin, control bit, or scaling capability. Is what I want to do possible? I need two of them to operate in lock step within a few nanoseconds, because I want to tie their per-channel outputs together in order to double the current.