hb288032mm1 Renesas Electronics Corporation., hb288032mm1 Datasheet - Page 36

• Manufacturer Part Number: hb288032mm1
• Description: Multimediacard 32 Mbyte - Hitachi Semiconductor
• Manufacturer: Renesas Electronics Corporation.

HB288032MM1
The data block size shall be defined by the host before it sends the card lock/unlock command. This will
allow different password sizes. The following paragraphs define the various lock/unlock command
sequences:
Note that the password length register (PWD_LEN) indicates if a password is currently set. When it equals
‘0’ there is no password set. If the value of PWD_LEN is not equal to zero the card will lock itself after
power up. It is possible to lock the card immediately in the current power session by set-ting the
LOCK/UNLOCK bit (while setting the password) or sending additional command for card lock.
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—Define the block length (CMD16), given by the 8bit card lock/unlock mode, the 8-bit password
—Send Card Lock/Unlock command with the appropriate data block size on the data line
—In case that the sent old password is not correct (not equal in size and content) then
—
—Define the block length (CMD16), given by the 8 bit card lock/unlock mode, the 8 bit password
—Send the card lock/unlock command with the appropriate data block size on the data line
—Select a card (CMD7), if not previously selected already
—Define the block length (CMD16), given by the 8 bit card lock/unlock mode, the 8 bit
with the command.
(PWD_LEN) and the password itself. In case that a password replacement is done, then the length
shall include the old password (currently used) followed by the new password.
size (in bytes), and the number of bytes of the currently used password.
LOCK_UNLOCK_FAILED error bit will be set in the status register.
size (in bytes), and the number of bytes of the new password. In case that a password replacement
is done, then the block size shall consider that both passwords, the old and the new one, are sent
password and its size will be saved in the PWD and PWD_LEN fields, respectively.
(PWD_LEN) and the password (PWD) itself (LOCK/UNLOCK bit is don’t care). If the PWD
password size (in bytes), and the number of bytes of the currently used password.
value (PWD_LEN) shall include both passwords, the old and the new one, and the PWD field
LOCK_UNLOCK_FAILED error bit will be set in the status register and the old password
and PWD_LEN content match the sent password and its size, then the content of the PWD
including 16 bit CRC. The data block shall indicate the mode (SET_PWD), the length
register is cleared and PWD_LEN is set to 0. If the password is not correct then the
including 16 bit CRC. The data block shall indicate the mode CLR_PWD, the length
PWD: The password (new or currently used depending on the command).
Setting the Password
Reset the Password:
Locking a card:
Select a card (CMD7), if not previously selected already
Select a card (CMD7), if not previously selected already