AT25SF321B volatile status register bits

Question

Which bits in the status register of the AT25SF321B are volatile, and which are non-volatile? The datasheet talks about volatile and non-volatile bits, but I can't find a table of which ones are which. In particular, is the Quad Enable bit volatile or non volatile (i.e. does setting it survive a reset)?

Sarpa_REN · Answer

Hi, The Write Status Register (01h) is for non volatile status register. It is explained under section 11.2. So, when you use this command to set The Quad Enable bit, it is non volatile. 
 There is also a Volatile version of the Status Register. Actually, during power up reset, the non-volatile Status Register bits (described under section 11.2) are copied to a volatile version of the Status Register that is used during device operation. This gives more flexibility to change the system configuration and memory protection schemes quickly without waiting for the typical non-volatile bit write cycles or affecting the endurance of the Status Register non-volatile bits. 
 Volatile version of the Status Register is explained under section 11.3 of the datasheet. For volatile version, the Write Enable for Volatile Status Register (50h) is used. 
 Best regards, Renesas Electronics Online Support

AT25SF321B volatile status register bits

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