sorry I misread MMC meaning dataflash
(got dataflash on the brain)

But the information you posted will help others help you.

> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of #LEE CHUN YONG#
> Sent: Friday, 16 January 2004 10:26 PM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: [OT:] Help MMC SPI Mode
>
>
> Currently I am using the MMC card in SPI mode. I would like to
> know more about the command, write and response sequence of the
> writing of 1 block of data. The block size of 512 byte is used.
> So I will start the writing process with write block
> command(CMD24). After that I will try to get the response from
> the MMC card( I did get bit string of '0000 0000'). After that I
> would output 10 clocks to MMC card. Then I will start to output
> start byte( bit string of '1111 1110' ). Subsequently, I will
> write 512 bytes of data. Then I just write 2 bytes of dummy byte
> as the CRC.  Since I didn't turn on the CRC feature of the MMC
> card, any 2 bytes of dummy data will be fine. After sending the 2
> bytes of CRC, I should immediately get bit string of 'xxx0 0101'
> as the data response. Are my procedures correct?
> Thank you in advance and have a nice day!
>
>
>
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