MCBSTM32EXL Keil, MCBSTM32EXL Datasheet - Page 477

• Manufacturer Part Number: MCBSTM32EXL
• Description: BOARD EVALUATION FOR STM32F103ZE
• Manufacturer: Keil

Specifications of MCBSTM32EXL

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

RM0008
the card must be selected before using it. The card lock/unlock commands have the
structure and bus transaction types of a regular single-block write command. The
transferred data block includes all of the required information for the command (the
password setting mode, the PWD itself, and card lock/unlock). The command data block
size is defined by the SDIO card host module before it sends the card lock/unlock command,
and has the structure shown in
The bit settings are as follows:
●
●
●
●
●
●
The following sections list the command sequences to set/reset a password, lock/unlock the
card, and force an erase.
Setting the password
1.
2.
3.
4.
The password length field (PWD_LEN) indicates whether a password is currently set. When
this field is nonzero, there is a password set and the card locks itself after power-up. It is
possible to lock the card immediately in the current power session by setting the
LOCK_UNLOCK bit (while setting the password) or sending an additional command for card
locking.
ERASE: setting it forces an erase operation. All other bits must be zero, and only the
command byte is sent
LOCK_UNLOCK: setting it locks the card. LOCK_UNLOCK can be set simultaneously
with SET_PWD, however not with CLR_PWD
CLR_PWD: setting it clears the password data
SET_PWD: setting it saves the password data to memory
PWD_LEN: it defines the length of the password in bytes
PWD: the password (new or currently used, depending on the command)
Select a card (SELECT/DESELECT_CARD, CMD7), if none is already selected.
Define the block length (SET_BLOCKLEN, CMD16) to send, given by the 8-bit card
lock/unlock mode, the 8-bit PWD_LEN, and the number of bytes of the new password.
When a password replacement is done, the block size must take into account that both
the old and the new passwords are sent with the command.
Send LOCK/UNLOCK (CMD42) with the appropriate data block size on the data line
including the 16-bit CRC. The data block indicates the mode (SET_PWD = 1), the
length (PWD_LEN), and the password (PWD) itself. When a password replacement is
done, the length value (PWD_LEN) includes the length of both passwords, the old and
the new one, and the PWD field includes the old password (currently used) followed by
the new password.
When the password is matched, the new password and its size are saved into the PWD
and PWD_LEN fields, respectively. When the old password sent does not correspond
(in size and/or content) to the expected password, the LOCK_UNLOCK_FAILED error
bit is set in the card status register, and the password is not changed.
Doc ID 13902 Rev 9
Table
141.
Secure digital input/output interface (SDIO)
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