![](http://datasheet.mmic.net.cn/280000/HB288016MM1_datasheet_16063021/HB288016MM1_8.png)
HB288016MM1
8
Registers
The HB288016MM1 contains the following information registers:
Name
Width
Type
Description
OCR
32
Programmed by the
manufacturer.
Read only for user
Supported voltage range, card power up status bit
CID
128
Programmed by the
manufacturer.
Read only for user
Card identification number, card individual number for
identification.
RCA
16
Programmed during
initialization, not readable
Relative card address, local system address of a card,
dynamically assigned by the host during initialization.
CSD
128
Programmed by the
manufacturer. Partially
programmable by the user.
Card specific data, information about the card operation
conditions.
CID and RCA are used for identifying and addressing the HB288016MM1. The third register contains the
card specific data record. This record is a set of information fields to define the operation conditions of the
HB288016MM1.
For the user the CID and the CSD are read only registers. They are read out by special commands (refer to
Chapter “Commands”). The RCA registers are write only registers. Unlike CID and CSD, RCA looses its
contents after powering down the card. Its value is reassigned in each initialization cycle. The
MultiMediaCard registers usage in SPI mode is summarized in Table “MultiMediaCard Registers in SPI
Mode”:
MultiMediaCard Registers in SPI Mode
Name
Available in SPI mode Width (Bytes)
Description
OCR
Yes
32
Operation condition register.
CID
Yes
16
Card identification data (serial number, manufacturer ID
etc.)
RCA
No
CSD
Yes
16
Card specific data, information about the card operation
conditions.