RM0319 datasheet(182/368 Pages) STMICROELECTRONICS

182 / 368 page

MMC-SD card/SDIO controller

RM0319

182/368

Doc ID 022640 Rev 3

14.5

Programming examples

This section explains some basic sequence flows of initialization and data transfer using the

memory card controller.

14.5.1

Detecting the SD card

Figure 58.

SD card detection

To enable interrupt for card detection, write 1 to the following bits:

–

Card Insertion Status Enable in the Normal Interrupt Status Enable register

–

Card Insertion Signal Enable in the Normal Interrupt Signal Enable register

–

Card Removal Status Enable in the Normal Interrupt Status Enable register

–

Card Removal Signal Enable in the Normal Interrupt Signal Enable register

When the host driver detects the card insertion or removal, clear its interrupt statuses.

If the card insertion interrupt is generated, write logic ‘1’ to card insertion in the normal

interrupt status register. If the card removal interrupt is generated, write logic ‘1’ to card

removal in the normal interrupt status register.

Check the card inserted in the present state register. If the card inserted is logic ‘1’, the

host driver can supply the power and the clock to the SD card. If the card inserted is

logic ‘0’, the other executing processes of the host driver must be immediately closed.

Enable Int of Card Detect

Start

Clr Card Detect Int Status

Check

Card Inserted

End

(1)

(2)

(3)

Card Detect Int occur

Card Inserted is 1b,

then recognize as insertion

Card Inserted is 0b,

then recognize as removal

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