Flash中內置了一個狀態寄存器（Status Register，SR）來指示Flash的當前工作狀態和各種操作是否成功。要讀取SR的當前值需要向CUI發送讀狀態寄存器命令（Read Status Register），命令碼為0x70，SR中的內容將在DQ[7:0]上輸出。The Read Status Register （0x70）command causes subsequent reads to output data from the SR until another command is issued. The SR bits are output on DQ[7:0].
