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System OFF is the deepest power saving mode the system can enter. In this mode, the system’s core
functionality is powered down and all ongoing tasks are terminated. The only mechanism that is functional
and responsive in this mode is the reset mechanism.
One or more blocks of the RAM can be retained in System OFF mode depending on the settings in the
RAMON register.
The system can be woken up from system OFF mode either from the DETECT signal generated by the GPIO
peripheral, or from a reset. When the system wakes up from OFF mode, a system reset is performed.
文档里面有说，两种方式唤醒。一种是把你的IO口接reset，另外一种设置你的这个IO口去检测DETECT signal |
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