说明：  Flash中内置了一个状态寄存器（Status Register，SR）来指示Flash的当前工作状态和各种操作是否成功。要读取SR的当前值需要向CUI发送读状态寄存器命令（Read Status Register），命令码为0x70，SR中的内容将在DQ[7:0]上输出。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].
(Flash is built into a status register (Status Register, SR) to indicate the status of Flash s current work and the success of the operation. To read the current value of SR need to CUI command sent Reading Status Register (Read Status Register), the command code is 0x70, SR content will be DQ [7:0] on output. 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].)