HB28E016MM2 View Datasheet(PDF) - Hitachi -> Renesas Electronics

Part Name

Description

Manufacturer

HB28E016MM2

MultiMediaCard™ 16 Mbyte/32 Mbyte/64 Mbyte/128 MByte

Hitachi -> Renesas Electronics 

HB28E016/D032/D064/B128MM2

Interface

These Hitachi MultiMediaCards' interface can operate in two different modes:

• MultiMediaCard mode

• SPI mode

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:

• CLK: with each cycle of this signal a 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 MultiMediaCard

and responses vice versa.

• DAT: is a bidirectional data channel with a width of one line. The DAT signal of the MultiMediaCard

operates in push pull mode.

• RSV: is pulled up with resistor (2 MΩ typ) in the MultiMediaCard. The external pull-up resistor should

be recommended if the system requires.

ROD

RDAT

RCMD

MultiMediaCard Host

CMD

DAT

CLK

1234567

MultiMediaCard

MultiMediaCard Mode Interface

All MultiMediaCards are connected directly to the lines of the MultiMediaCard bus. The following table

defines the card contacts.

4

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