38006c3c82
Regular rng peripheral, with one additional bit : clock error detection apparently available on l4 chips). Curiously, Clock error detection is _disabled_ when bit is set, but bit is cleared by default, so peripheral / clock error detection behaves like all other chips.. NB: RNG need proper rcc_ccicr_rngsel bits set to work, no clock is set by default. Note also that on that chip fRNGCLK must be higher than fHCLK/32