BU2505FV - Can I use SPI with this part?
The only real difference between the chip's serial protocol and SPI is that LD (the Slave Select analogue) must be pulsed high to latch the internal shift register but kept low at all other times. If you add a pulse former to that line you can make it behave like any other SPI device.

When sending 2 bytes the first 2 bits sent will be discarded by the chip (will actually get shifted out of DO with 14 clocks of delay), the rest are as described in the spec.