L4 PAC RTC doesn't work on 41x and 42x. Distinction is on 3rd digit. RM has sep RTC sections. PAC only uses 43+ one. CR is on a diff address, so this is fundamentally incompatible.

I'm not sure how to address this: The PAC split on 3rd digit works for most other periphs. Probably add 2 sep RTC modules, like how the RM has 2 sep chapters.

My best thought on an approach: Use two separate RTC modules, in the vein of how the RM splits it up into 2 chapters.