hb28j128mm3 Renesas Electronics Corporation., hb28j128mm3 Datasheet - Page 4
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hb28j128mm3
Manufacturer Part Number
hb28j128mm3
Description
Multimediacard 32 Mbyte/64 Mbyte/128 Mbyte/256 Mbyte/512 Mbyte
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.HB28J128MM3.pdf
(91 pages)
- Current page: 4 of 91
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HB28K032/L064/J128/J256/J512MM3, HB28K032/L064/J128/J256RM3
Interface
These Renesas MultiMediaCards' 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 MultiMediaCard mode, 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.
Rev.0.02, Sep.15.2004, page 4 of 89
MultiMediaCard mode
SPI mode
CLK: with each cycle of this signal a one-bit transfer on the command and data lines is done. The
CMD: is a bidirectional command channel used for card initialization and data transfer commands.
DAT: is a bidirectional data channel with a width of one line. The DAT signal of the MultiMediaCard
RSV: is pulled up with resistor (2 M typ) in the MultiMediaCard. The external pull-up resistor
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.
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 MultiMediaCard
and responses vice versa.
operates in push pull mode.
should be recommended if the system requires.
MultiMediaCard Host
R OD
MultiMediaCard Mode Interface
R DAT
R CMD
MultiMediaCard
1 2 3 4 5 6 7
CMD
DAT
CLK
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