Atmel Xplained Pro Evaluation Kit ATSAM4E-XPRO ATSAM4E-XPRO Data Sheet

1107

SAM4E [DATASHEET]

Atmel-11157D-ATARM-SAM4E16-SAM4E8-Datasheet_12-Jun-14

The SD Memory Card bus includes the signals listed in 

Notes:

1.

I: input, O: output, PP: Push Pull, OD: Open Drain.

2.

When several HSMCI (x HSMCI) are embedded in a product, MCCK refers to HSMCIx_CK, MCCDA to 
HSMCIx_CDA, MCDAy to HSMCIx_DAy.

Note:

When several HSMCI (x HSMCI) are embedded in a product, MCCK refers to HSMCIx_CK, MCCDA to HSMCIx_CDA 
MCDAy to HSMCIx_DAy.

When the HSMCI is configured to operate with SD memory cards, the width of the data bus can be selected in the
HSMCI_SDCR. Clearing the SDCBUS bit in this register means that the width is one bit; setting it means that the
width is four bits. In the case of High Speed MultiMedia cards, only the data line 0 is used. The other data lines can
be used as independent PIOs. 

After a power-on reset, the cards are initialized by a special message-based High Speed MultiMedia Card bus
protocol. Each message is represented by one of the following tokens:

1

CD/DAT[3]

I/O/PP

Card detect/ Data line Bit 3

MCDz3

2

CMD

PP

Command/response

MCCDz

3

VSS1

S

Supply voltage ground

VSS

4

VDD

S

Supply voltage

VDD

5

CLK

I/O

Clock

MCCK

6

VSS2

S

Supply voltage ground

VSS

7

DAT[0]

I/O/PP

Data line Bit 0

MCDz0

8

DAT[1]

I/O/PP

Data line Bit 1 or Interrupt

MCDz1

9

DAT[2]

I/O/PP

Data line Bit 2

MCDz2

2 3 4 5 6

1

7 8

SD CARD

9

2345

6

17

MCDA0 - MCDA3

MCCDA

MCCK

8

SD CARD

9