STM32F101xx, STM32F102xx, STM32F103xx, STM32F105xx and ...

Secure digital input/output interface (SDIO)
RM0008
Table 140.
CMD
index
Type
I/O mode commands (continued)
Argument
Response
format
Abbreviation
Description
CMD40 bcr [31:0] stuff bits R5 GO_IRQ_STATE Places the system in the interrupt mode.
CMD41
Reserved
Table 141.
Lock card
CMD
index
Type
Argument
Response
format
Abbreviation
Description
CMD42 adtc [31:0] stuff bits R1b LOCK_UNLOCK
Sets/resets the password or locks/unlocks
the card. The size of the data block is set
by the SET_BLOCK_LEN command.
CMD43
...
CMD54
Reserved
Table 142.
CMD
index
Application-specific commands
Type
Argument
Response
format
Abbreviation
Description
CMD55
ac
[31:16] RCA
[15:0] stuff bits
R1
APP_CMD
Indicates to the card that the next command
bits is an application specific command rather
than a standard command
CMD56
adtc
[31:1] stuff bits
[0]: RD/WR
Used either to transfer a data block to the card
or to get a data block from the card for general
purpose/application-specific commands. The
size of the data block shall be set by the
SET_BLOCK_LEN command.
CMD57
...
CMD59
Reserved.
CMD60
...
CMD63
Reserved for manufacturer.
20.5 Response formats
All responses are sent via the MCCMD command line SDIO_CMD. The response
transmission always starts with the left bit of the bit string corresponding to the response
code word. The code length depends on the response type.
A response always starts with a start bit (always 0), followed by the bit indicating the
direction of transmission (card = 0). A value denoted by x in the tables below indicates a
variable entry. All responses, except for the R3 response type, are protected by a CRC.
Every command code word is terminated by the end bit (always 1).
There are five types of responses. Their formats are defined as follows:
490/995 Doc ID 13902 Rev 9