How to disable to SPI?

Hi sir,

I use the MSP430F5529 to develop my system.

I have some questions about LPM mode.

1. If the MSP430 enter LPM3 and I make sure the SPI slave doesn't work, does the SPI consume the energy(SPI master mode)?
If it does, how to disable it?

Because I found msp430 the peak current is 150uA after entering LPM3, where it is only one peak.
After the peak current , the current is less than 10uA.

It hard to find the root cause,  any suggestions?

2. I know the ACLK is disabled in LPM4.
But I configure a timer with ACLK and then MSP430's LPM mode is LPM4.
MSP430 works well.(MSP430 wakeup from LPM4 event timer use ACLK)
Above case, does msp430 change LPM mode from LPM4 from LPM3 automatically? 

Thanks.