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How to activate register ADCPSSI?

Other Parts Discussed in Thread: TM4C123GH6PGE

HI
I'm using TM4C123GH6PGE, and CCSv5.

When using ADC, sample sequence is needed.
When I try to initiate sample sequencer0 by writing 1 to ADCPSSI,
register value does not change.

According to datasheet, it initiates sample sequencer if the sequencer is enabled.

I enabled it, but ADCPSSI register value does not change.

Why this is happen?