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SCI interrupt FIFO register problem

Hello everybody~~

I have some question about SCI FIFO register.

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SCI FIFO FFTX bits(4~0).These are compared with bits(12~8).When set bits(4~0) that exceed bits(12~8) ,then it will produce interrupt flag??........................(1)

SCI FIFO FFRX bits(4~0).These are compared with bits(12~8).When set bits(4~0)  that exceed bits(12~8) ,then it will produce interrupt flag??.......................(2)

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SCI FIFO FFTX bits(5) set 1. it  mean that  when bits(4~0) small bits(12~8) or equal it,it will produce interrupt flag??.......................................................................(3)

These seems to be a contradiction between (1) and (3).

I want to know how those register to work?

Thank you

Best regards,

Tseng Adam