Phil,

I've used a very simple level reduction design on the input pins of the MMC.  The PIC inputs will work on the 3.3v output of the MMC.  I didn't invent it, can't remember where I found it.

                      47K
                 *--/\/\/\/\--*
(PIC output) O---|            |---O (MMC in: CLK, SI,CS)
                 *-----||-----*
                      47pf

Laugh if you will, it works.  It keeps working when the PIC is running at 3.3v, too.

..Alan


-----Original Message-----
From: pic microcontroller discussion list [mailto:PICLIST@MITVMA.MIT.EDU] On Behalf Of Philip Pemberton
Sent: Wednesday, April 14, 2004 8:42 AM
To: PICLIST@MITVMA.MIT.EDU
Subject: [PIC]: MultiMediaCard and voltage shifting


Hi,
  Once again, it seems I've picked a project that has a very low chance of success (well, in its current form anyway).
  I want to connect a MultiMediaCard up to a PIC16F628

<SNIP>

Thanks.
--
Phil.                              | Acorn Risc PC600 Mk3, SA202, 64MB, 6GB,
philpem@dsl.pipex.com              | ViewFinder, 10BaseT Ethernet, 2-slice,
http://www.philpem.dsl.pipex.com/  | 48xCD, ARCINv6c IDE, SCSI ... This tagline was reclaimed and is not yet stolen.

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