MCBSTM32EXL Keil, MCBSTM32EXL Datasheet - Page 479

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

Specifications of MCBSTM32EXL

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

RM0008
20.4.11
The unlocking function is only valid for the current power session. When the PWD field is not
clear, the card is locked automatically on the next power-up.
An attempt to unlock an unlocked card fails and the LOCK_UNLOCK_FAILED error bit is set
in the card status register.
Forcing erase
If the user has forgotten the password (PWD content), it is possible to access the card after
clearing all the data on the card. This forced erase operation erases all card data and all
password data.
1.
2.
3.
4.
An attempt to use a force erase on an unlocked card fails and the LOCK_UNLOCK_FAILED
error bit is set in the card status register.
Card status register
The response format R1 contains a 32-bit field named card status. This field is intended to
transmit the card status information (which may be stored in a local status register) to the
host. If not specified otherwise, the status entries are always related to the previously issued
command.
Table 128
table are abbreviated as follows:
Type:
●
●
●
●
Clear condition:
●
●
●
Select a card (SELECT/DESELECT_CARD, CMD7), if none is already selected.
Set the block length (SET_BLOCKLEN, CMD16) to 1 byte. Only the 8-bit card
lock/unlock byte (byte 0 in
Send LOCK/UNLOCK (CMD42) with the appropriate data byte on the data line including
the 16-bit CRC. The data block indicates the mode (ERASE = 1). All other bits must be
zero.
When the ERASE bit is the only bit set in the data field, all card contents are erased,
including the PWD and PWD_LEN fields, and the card is no longer locked. When any
other bits are set, the LOCK_UNLOCK_FAILED error bit is set in the card status
register and the card retains all of its data, and remains locked.
E: error bit
S: status bit
R: detected and set for the actual command response
X: detected and set during command execution. The SDIO card host must poll the card
by issuing the status command to read these bits.
A: according to the card current state
B: always related to the previous command. Reception of a valid command clears it
(with a delay of one command)
C: clear by read
defines the different entries of the status. The type and clear condition fields in the
Doc ID 13902 Rev 9
Table
141) is sent.
Secure digital input/output interface (SDIO)
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