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By specifying the appropriate opcode, data can be read from the main memory or from the data buffer. The DataFlash supports two categories of read modes in relation to the SCK sig- nal. The differences between the modes are in respect to the inactive state of the SCK signal as well as which clock cycle data will begin to be output. The two categories, which are com- prised of four modes total, are defined as Inactive Clock Polarity Low or Inactive Clock Polarity High and SPI Mode o or SPI Mode 3. A separate opcode (refer to Table l on page 11 for a complete list) is used to select which category will be used for reading. Please refer to the "Detailed Bit-Ievel Read Timing" diagrams in this datasheet for details on the clock cycle sequences for each mode.