Datasheet是这样写的：
A pull-up should be placed on WE to hold it inactive during power-up. This
pull-up is effective only if the WE signal is tristate during
power-up. Many MPUs tristate their controls on power-up. This
should be verified when using the pull-up. When the nvSRAM
comes out of power-on-RECALL, the MPU must be active or the
WE held inactive until the MPU comes out of reset.
就是说为了确保上电的时候WE不起作用。当nvSRAM power-on-RECALL时，直到MPU复位后WE才有效。
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