1. I have a slave device running on SPI which needs to communicate with MCU.
2. I need to set MCU SPI mode.
3. Which SPI mode is this. I think its SPI mode 1.

Edit: Below pic I found in slave datasheet

 

Hi,
Look at page #23-11 of this PDF.
E

 

This could be of great help to you:
http://elm-chan.org/docs/spi_e.html
From my understanding, mode is 0.

 

I don't think this is SPI at all, if you want to use common microcontrollers to interface with it. It seems as if you clock in 18 bits on SDI, and then the output bits begin--that is a long way from standard. Normally you'd send and receive 8 bits simultaneously, but maybe there's a processor somewhere that has "programmable SPI" that lets you select everything. If you're bit-banging it, then you just follow the diagram and it is what it is, SPI or something unique.

 

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  Remove John P, 27 minutes ago, which SPI mode is this
  It seems as if you clock in 18 bits on SDI, and then the output bits begin

It is 24 bits. Sure enough, I7 and 17 look the same!

 

It is 24 bits. Sure enough, I7 and 17 look the same!

Yabbut... there's 32 clocks?!

 

Oh yeah, it's a 24-bit data and address frame; I have to do something about this astigmatism. If the number of bits is a multiple of 8, then conventional SPI should work--just be sure you know which bytes are being sent. Order is high bit first. You can look up the mode here:
http://en.wikipedia.org/wiki/Serial_Peripheral_Interface_Bus#Clock_polarity_and_phase

 

@mitko89 , I think its mode1 because transmitter data i.e which is master have valid data on falling edge of clk.