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questions about clock control in 66k2h evm

Other Parts Discussed in Thread: DAC8550

Hi

I am using a 66k2h evm. I have a few questions during seeing a schematic.

i saw a DAC8550 DAC chip connected to VCXO in there.

it's role is to tune frequency of VCXO. is it right?

here's questions.

1. why does it be controlled by DSP using SPI, not MCU?

Might it be due to using clock locking to GPS signal, when it needs?

2. To control DAC8550, it requires to use 24bit word in SPI interface. but DSP's SPI supports from 2 to 16 bits word.

How can i make a 24bit word? sholud i write a 12bit word twice with CS HOLD option?

I will be pleased if someone gives me answers.

thanks in advance.