Serial interface flash memory apparatus and writing method for status register thereof

摘要

A serial interface flash memory apparatus and a writing method for a status register thereof are disclosed. The writing method for the status register mentioned above includes: receiving a write command with an updated data for the status register; writing the updated data to a volatile latch and set an update flag according to whether or not a write-protected data in the status register is updated by the write command; and writing the data from the volatile latch to the status register according to the update flag when a power down process of the serial interface flash memory apparatus is processed.

主权项

1. A writing method for a status register used for a serial interface flash memory apparatus, the method comprising:
receiving a write command for an update data of a status register; determining whether or not a write-protected data of the status register is updated according to the update data, writing an update write-protected data of the update data to a latch which is volatile type and setting an update flag according to a result by the determination; and when the serial interface flash memory apparatus enters a power down process, writing the data from the latch to the status register according to the update flag, wherein, the status register is composed of a plurality of non-volatile memory cells.