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PICList Thread
'EE. memory card'
2010\01\07@230754 by Rich

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I am looking for a reference schematic for interfacing a memory card like an SD Memory card to an 8-bit controller.  Does anyone know of one?

2010\01\07@233232 by Harold Hallikainen

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> I am looking for a reference schematic for interfacing a memory card like
> an SD Memory card to an 8-bit controller.  Does anyone know of one?

MMC and SD cards have an SPI interface. See
www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1824&appnote=en532040
.

Harold



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2010\01\08@003602 by Matthew Schinkel

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Here you go:



http://justanotherlanguage.org/content/tutorial_sd_card



Matt.

> From: spam_OUTrgrazia1TakeThisOuTspamrochester.rr.com
> To: .....piclistKILLspamspam@spam@mit.edu
> Subject: EE. memory card
> Date: Thu, 7 Jan 2010 23:07:31 -0500
>
> I am looking for a reference schematic for interfacing a memory card like an SD Memory card to an 8-bit controller. Does anyone know of one?
> --

2010\01\08@072418 by Rich

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Thank you, Harold.

----- Original Message -----
From: "Harold Hallikainen" <haroldspamKILLspamhallikainen.com>
To: "Microcontroller discussion list - Public." <.....piclistKILLspamspam.....mit.edu>
Sent: Thursday, January 07, 2010 11:51 PM
Subject: Re: EE. memory card


{Quote hidden}

> --

2010\01\08@072428 by Rich

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Thank you, Mathew.

----- Original Message -----
From: "Matthew Schinkel" <EraseMEmattschinkelspam_OUTspamTakeThisOuThotmail.com>
To: <piclistspamspam_OUTmit.edu>
Sent: Friday, January 08, 2010 12:35 AM
Subject: RE: EE. memory card


{Quote hidden}

>> --

2010\01\08@072716 by Rich

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Both great sites from you and Harold.  Thanks guys.



----- Original Message -----
From: "Matthew Schinkel" <RemoveMEmattschinkelTakeThisOuTspamhotmail.com>
To: <spamBeGonepiclistspamBeGonespammit.edu>
Sent: Friday, January 08, 2010 12:35 AM
Subject: RE: EE. memory card


{Quote hidden}

>> --

2010\01\08@085156 by Matthew Schinkel

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There is also FAT32 with JAL, but it is not on the website yet. Very easy to implement.



Matt.

> From: rgrazia1EraseMEspam.....rochester.rr.com
> To: EraseMEpiclistspammit.edu
> Subject: Re: EE. memory card
> Date: Fri, 8 Jan 2010 07:24:03 -0500
>
> Thank you, Mathew.
>
> {Original Message removed}

2010\01\08@193440 by Rich

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Thank you, Mathew.  This is my first attempt to implement this type of
memory. The tutorial is very helpful.   Thanks to You and Harold I have some
direction.

{Original Message removed}

2010\01\08@233306 by Sarin Sukumar A

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--000e0cd4a790c4c246047cb3cb9a
Content-Type: text/plain; charset=ISO-8859-1

you can refer this schematic
YOurs SaRIn....


On Fri, Jan 8, 2010 at 4:33 PM, Rich <RemoveMErgrazia1EraseMEspamEraseMErochester.rr.com> wrote:

> Thank you, Mathew.  This is my first attempt to implement this type of
> memory. The tutorial is very helpful.   Thanks to You and Harold I have
> some
> direction.
>
> {Original Message removed}

2010\01\09@014413 by Rich

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Thank you Sarin.  I appreciate all the help you guys on the list have given
me.  The schematic you sent together with the other info has been very good
for me to learn how to do this.  Thanks again.


{Original Message removed}

2010\01\09@171348 by Dario Greggio

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Sarin Sukumar A ha scritto:
> you can refer this schematic


sorry for coming in: are pull-ups needed for SDcards, always?

thanks


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2010\01\09@184153 by Matthew Schinkel

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They are not pull-ups, they are voltage deviders. They are only there for 5v to 3.3v conversion. SD cards are 3.3v



Matt.

{Quote hidden}

> --

2010\01\10@044015 by Dario Greggio

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Matthew Schinkel ha scritto:
> They are not pull-ups, they are voltage deviders. They are only there for 5v to 3.3v conversion. SD cards are 3.3v


Hmm, I see, ok I know.
But from that schematic they really looked like pull-ups



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Ciao, Dario
--
Cyberdyne

2010\01\10@050552 by Sarin Sukumar A

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Actually i hv done that before two years...
i made that by looking in the sdcard specs of sandisk... and it worked...but
about pullups it is recommended that refer the document again..

YOurs SaRIn....


On Sun, Jan 10, 2010 at 3:09 PM, Dario Greggio <EraseMEadpm.tospamspamspamBeGoneinwind.it> wrote:

{Quote hidden}

> -

2010\01\11@041524 by Rich

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Thank, Mathew

----- Original Message -----
From: "Matthew Schinkel" <RemoveMEmattschinkelKILLspamspamhotmail.com>
To: <piclistSTOPspamspamspam_OUTmit.edu>
Sent: Saturday, January 09, 2010 6:41 PM
Subject: RE: EE. memory card


{Quote hidden}

>> --

2010\01\11@092546 by Rich

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Thanks for the help, Sarin

----- Original Message -----
From: "Sarin Sukumar A" <EraseMEsarinsukumarspamEraseMEgmail.com>
To: "Microcontroller discussion list - Public." <@spam@piclist@spam@spamspam_OUTmit.edu>
Sent: Sunday, January 10, 2010 5:05 AM
Subject: Re: EE. memory card


{Quote hidden}

>> --

2010\01\13@000143 by mattschinkel

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SaRIn, the 50k resistors in the circuit you sent are doing nothing, With your
schematic you must have a 3.3v PIC, otherwise 5v will go into the SD Card.
Sd Card datasheet says 3.3v only

Matt.


sarinsukumar wrote:
{Quote hidden}

>> {Original Message removed}

2010\01\13@041048 by Sarin Sukumar A

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yes there i have specified that 3.3 V coming from pic,,, isnt
it????<http://mailman.mit.edu/mailman/listinfo/piclist>

>

2010\01\13@130434 by mattschinkel

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Yes, I see "3.3v FROM dsPIC EXPLORER", but..

"PIN1 CS", "PIN2 SDI" and "PIN5 SCK" (sd card inputs) should be from a 3.3v
microcontroller only, or have voltage devider resistors from a 5v
microcontroller. Of course the sd card's SDO does not need voltage
conversion since it is a sd card output.

Sorry, I don't know much about dsPIC explorer and I don't know what PIC you
are using. I'm sure your circuit would work with a 5v microcontroller, but
you may eventually kill a sd card.

Matt.


sarinsukumar wrote:
>
> yes there i have specified that 3.3 V coming from pic,,, isnt
> it????<mailman.mit.edu/mailman/listinfo/piclist>
>
>>
> --

2010\01\14@005050 by Sarin Sukumar A

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yes mine was a 3.3 v microcontroller
if u use 5V micro controller, then some circuitary is needed for voltage
level conversion

2010\01\14@135039 by mattschinkel

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Ok, so I think no resistors will be needed for a 3.3v microcontroller.

Matt.


sarinsukumar wrote:
>
> yes mine was a 3.3 v microcontroller
> if u use 5V micro controller, then some circuitary is needed for voltage
> level conversion
> --

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