Cypress FM4 Series - Power Control Register

CHAPTER 15: SD Card Interface
FM4 Peripheral Manual, Doc. No. 002-04856 Rev. *E 855
2.11 Power Control Register
This register is used to control the SD Bus voltage.
D07 D04
D03 D01
D00
Rsvd
SD Bus Voltage
Select
SD Bus Power
(*)
*: This product enters the power on state it one of the following conditions is met.
"0b111" (setting 3.3 V) is written to the SD Bus Voltage Select bits.
"0b110" (setting 3.0 V) is written to the SD Bus Voltage Select bits.
For other details of this register, refer to SD Specifications Part A2.