Do we need pull ups in SPI with SD card

Discussion in 'General Electronics Chat' started by aamirali, Sep 21, 2012.

  1. aamirali

    Thread Starter Member

    Feb 2, 2012
    1. I was reading MSP430 interface with SD card & found the schematic below. Do we need pull up on MOSI & MIS0 lines. Won't they slow down the speed ot they are optional.

    2. Is it necessary to pull up 9 pin & gnd 8 pin

    3. I am working on 4GB class 4 SD card. Is the entire range is writable or some is protected.

    If I chose 512 bytes sector, then no of blocks are = 4GB/512 bytes. Is it???????