Product manual

as well, while they are not used. It is defined so, in order to keep compatibility to

MultiMediaCards.

3) After power up this line is input with 50KOhm pull-up (can be used for card detection or SPI

mode selection). The pull-up should be disconnected by the user, during regular data transfer,

with SET_CLR_CARD_DETECT (ACMD42) command

4) NC pins should be left open.

3.1.2. miniSD Card Registers

Table 3-2. miniSD Card Registers

Name Width Description

CID 128 Card identification number: individual card number for identification.

RCA

16 Relative card address: local system address of a card, dynamically

suggested by the card and approved by the host during initialization.

CSD 128 Card specific data: information about the card operation conditions.

SCR 64 SD Configuration Register: information about the miniSD Card’s special

features capabilities.

OCR 32 Operation Condition Register

NOTE: 1) The RCA register is not available in SPI Mode.

The host may reset the cards by switching the power supply off and on again. The card has its own power-on

detection circuitry that puts the card into an idle state after the power-on. The card can also be reset by sending the

GO_IDLE (CMD0) command.