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为什么PxDS寄存器不起作用？

Charles Zhang
Prodigy 90 points
Other Parts Discussed in Thread: MSP430F5438A

MSP430F5438A的片子，在PxDS中将对应pin设置成1 （Full output drive strength），测量后发现电压还是那么大，一点没增加。

代码：

P1DS = 0x04;
P1OUT |= 0x14;

按说P1.2是Full output drive strength，但没测出来。

是怎么回事呢？