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TMS320F28377D: _IQ15SinPU计算结果难以理解

Part Number: TMS320F28377D

我在cpu1中进行测试,

test1=_IQ15SinPU(1),在CCS Expression 中观察到计算结果是6

test1=_IQ15SinPU(3.1415926),在CCS Expression 中观察到计算结果是18

我难以理解这个6和18的结果是怎么得出的?

还望解答,谢谢