Methods for data synchronization between a sensor hub and an application processor and apparatuses using the same

An apparatus for data synchronization between a sensor hub and an application processor, comprising:

• a memory storing a sensor-data stream;
• a sensor hub, coupled to a micro-sensor and the memory, generating and adding a plurality of first absolute time stamps in the sensor-data stream;
• and generating and adding a plurality of pieces of first sensor data and a plurality of first relative time stamps in the sensor-data stream between the moments of generating each two adjacent first absolute time stamps, wherein each first relative time stamp is associated with one piece of first sensor data;
• and
• an application processor, coupled to the memory, reading an ID (identifier) from the sensor-data stream;
• determining whether the ID is a time ID;
• when the ID is the time ID, reading a second absolute time stamp from the sensor-data stream and storing the second absolute time stamp in the application processor;
• and when the ID is not the time ID, reading one piece of second sensor data and a second relative time stamp from the sensor-data stream, generating a recovered time stamp according to the second absolute time stamp and the second relative time stamp and converting the recovered time stamp to a value of an RTC of the application processor.