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Is the clock frequency of W25Q 128 Flash chip the maximum or the specified value in the data?

① Maximum value. You can drive Agera RS at 40kph.

② It's not so convenient. Access requires sequential operation through SPI or DSPI or QSPI interface, and it is impossible to access a single instruction. Moreover, Flash needs to be erased when it is written, and it is impossible to use it freely like RAM. Its advantages are large capacity and no loss.