3.26.2009

SD Password Protect Command Sequence

set password :
  • CMD7 : Select Card
  • CMD16 : Set Block Length
  • CMD42 with Block Data
reset password :
  • CMD7 : Select Card
  • CMD16 : Set Block Length
  • CMD42 with BlockData
Lock
  • CMD7 : Select Card
  • CMD16: Set Block Length
  • CMD42 with BlockData
Unlock
  • CMD7 : Select Card
  • CMD16 : Set Block Length
  • CMD42 with BlockData
Erase
  • CMD7 : Select Card
  • CMD16 : Set Block Length (to 1 byte only)
  • CMD42 with BlockData



Result of CMD42

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