K66F SDHC storage size

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K66F SDHC storage size

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songja
Contributor III

Hello,

I am trying to buy a micro-SD card and I have looked at the datasheet but I couldn't find what the maximum storage size is that K66F supports. 

Also, how fast can K66F transfer data to SD card?

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mjbcswitzerland
Specialist V

Hi

The K66 supports all sizes of SD card - it is the firmware that performs the FAT and FAT32 is OK for all sizes too.

This is a transfer of a large file using the uTasker FRDM-K66F USB-MSD to SD card configuration showing close to 16MB/s (limited also by HS USB) which is fairly close to a dedicated commercial reader that achieves around 18MB/s. The SD card itself can be read at > 20MB/s.
By overclocking the SD card (75MHz )20MB/s USB-MSD read speeds close to 20MB/s are possible with the uTasker configuration but it is not recommended for real work.

pastedImage_1.png

Writing is generally a lot slower than reading and has dependencies on the SD card type and the FAT file system used.
The K66 is not the limiting factor when writing since it can write at the same speed as it reads but the particular SD card itself will be much slower.

Regards

Mark

Complete K66 solutions, training and support:http://www.utasker.com/kinetis.html
Kinetis K66:
- http://www.utasker.com/kinetis/TWR-K65F180M.html
- http://www.utasker.com/kinetis/FRDM-K66F.html
- http://www.utasker.com/kinetis/TEENSY_3.6.html

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233 Views
mjbcswitzerland
Specialist V

Hi

The K66 supports all sizes of SD card - it is the firmware that performs the FAT and FAT32 is OK for all sizes too.

This is a transfer of a large file using the uTasker FRDM-K66F USB-MSD to SD card configuration showing close to 16MB/s (limited also by HS USB) which is fairly close to a dedicated commercial reader that achieves around 18MB/s. The SD card itself can be read at > 20MB/s.
By overclocking the SD card (75MHz )20MB/s USB-MSD read speeds close to 20MB/s are possible with the uTasker configuration but it is not recommended for real work.

pastedImage_1.png

Writing is generally a lot slower than reading and has dependencies on the SD card type and the FAT file system used.
The K66 is not the limiting factor when writing since it can write at the same speed as it reads but the particular SD card itself will be much slower.

Regards

Mark

Complete K66 solutions, training and support:http://www.utasker.com/kinetis.html
Kinetis K66:
- http://www.utasker.com/kinetis/TWR-K65F180M.html
- http://www.utasker.com/kinetis/FRDM-K66F.html
- http://www.utasker.com/kinetis/TEENSY_3.6.html

View solution in original post