Can I interface micro SD card with PIC18f4550

[aameer]

Hello Friends,
i have pic18f4550 micro controller. i want to interface SD card with it. Will it works and also will it works on 4 MHz crystal.. Please Reply me.

With Regards
Aameer

 

[dustmote]

Yes, of course this is possible.
The SD card, whether it is micro SD or Mini SD, or Standard SD, can communicate with your microcontroller via the SPI protocol.

There is a library available from HiTech which will allow you to use the SPI protocol with ease.
It can work at any low speed such as from your 4 MHz crystal, but please remember that there is a maximum speed, although you would be unlikely to achieve it with a regular microcontroller.

PLEASE do remember that the SD card operates at a voltage of about 3.3V, but your microcontroller operates at about 5V, so you must use a level shifter in order to not burn out the SD card due to the excessive voltage.

There are MANY tutorials available on the web about this exact subject.

Good luck!

 

[aameer]

Thanks dustmote.
can i know the interfacing circuit please. i am little bit confused

 

[keith1200rs]

The pic18f4550 can run at 3.3V so I would suggest you use that. Also, why not run the PIC at 48MHz (I assume it has either a PLL or high speed internal clock or both)? It would speed up data transfers.

Keith