hb288032mm1 Renesas Electronics Corporation., hb288032mm1 Datasheet - Page 4
hb288032mm1
Manufacturer Part Number
hb288032mm1
Description
Multimediacard 32 Mbyte - Hitachi Semiconductor
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.HB288032MM1.pdf
(80 pages)
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HB288032MM1
Interface
The HB288032MM1 interface can operate in two different modes:
Both modes are using the same pins. The default mode is the MultiMediaCard mode. The SPI mode is
selected by activating (= 0) the CS signal (Pin1) and sending the CMD0.
MultiMediaCard Mode
In the HB288032MM1, all data is transferred over a minimal number of lines:
All MultiMediaCards are connected directly to the lines of the MultiMediaCard bus. The following table
defines the card contacts.
4
MultiMediaCard mode
SPI mode
CLK: with each cycle of this signal an one bit transfer on the command and data lines is done. The
frequency may vary between zero and the maximum clock frequency. The MultiMediaCard bus master
is free to generate these cycles without restrictions in the range of 0 to 20 MHz.
CMD: is a bidirectional command channel used for card initialization and data transfer commands.
The CMD signal has two operation modes: open drain for initialization mode and push pull for fast
command transfer. Commands are sent from the MultiMediaCard bus master to the HB288032MM1
and responses vice versa.
DAT: is a bidirectional data channel with a width of one line. The DAT signal of the HB288032MM1
operates in push pull mode.
MultiMediaCard Host
R OD
MultiMediaCard Mode Interface
R DAT
R CMD
HB288032MM1
1 2 3 4 5 6 7
CLK
CMD
DAT
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