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What does the HRST pin on M20050 really do?
After resetting and un-resetting (pin 10, HRST of M20050), the M20050 comes back on line with it's previous settings (rather than power up default settings).  The data sheet doesn't address what the real behavior is.  The M20050 HRST (pin 10) seems to be more of a sleep mode pin.   Is there any further information on what this pin really does?

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Hi , The HRST pin is used to restart the module. this forces a volatile RAM data loss. However the Non-volatile backup RAM content is not cleared and can still provide a fast TTFF.

to reset the module to a default configuration you can use PMTK command 104 (PMTK_CMD_FULL_COLD_START).

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