如果在响应低优先级中断时高优先级中断使能，用户必须在低优先级中断响应程序中保存那些关键的寄存器值。
If high priority interrupts are not disabled during low priority interrupts, users must save the key registers in software during a low priority interrupt.
上拉寄存器是控制对应端口上拉使能的。
The port pull-up register controls the pull-up resister enable/disable of each port group.
上拉寄存器是控制对应端口上拉使能的。
The port pull-up register controls the pull-up resister enable/disable of each port group.
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