AT45DB161D中的0x9f是什么意思

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AT45DB161D中的0x9f是什么意思 [复制链接]

FLASH_ID = SPI_FLASH_ReadID();  

u32 SPI_FLASH_ReadID(void)

{

  u32 Temp = 0, Temp0 = 0, Temp1 = 0, Temp2 = 0, Temp3;

  /* Select the FLASH: Chip Select low */

  SPI_FLASH_CS_LOW();  

  /* Send "RDID " instruction */

  SPI_FLASH_SendByte(0x9F);   /**--------------------------------**/

  /* Read a byte from the FLASH */

  Temp0 = SPI_FLASH_SendByte(Dummy_Byte);

  /* Read a byte from the FLASH */

  Temp1 = SPI_FLASH_SendByte(Dummy_Byte);

  /* Read a byte from the FLASH */

  Temp2 = SPI_FLASH_SendByte(Dummy_Byte);

  /* Read a byte from the FLASH */

  Temp3 = SPI_FLASH_SendByte(Dummy_Byte);  /*** 0xff */

  

  /* Deselect the FLASH: Chip Select high */

  SPI_FLASH_CS_HIGH();   

  Temp = (Temp0 << 24) | (Temp1 << 16) | (Temp2<<8) | Temp3;

  return Temp;

}

0x9f从哪里来?

仙猫