CHAPTER 15: SD Card Interface
FM4 Peripheral Manual, Doc. No. 002-04856 Rev. *E 857
2.13 Wakeup Control Register
This register is mandatory for the Host Controller, but wakeup functionality depends on the Host
Controller system hardware and software. The Host Driver shall maintain voltage on the SD Bus, by
setting the SD Bus Power bit to 1 in the Power Control Register, when a wakeup event via a Card
Interrupt is desired.