In Serial Memory mode, the QSPI acts as a serial Flash memory controller. The QSPI can be used to read data from the serial Flash memory allowing the CPU to execute code from it (XIP execute in place). The QSPI can also be used to control the serial Flash memory (Program, Erase, Lock, etc.) by sending specific commands. In this mode, the QSPI is compatible with single-bit SPI, Dual SPI and Quad SPI protocols.
To activate this mode, QSPI_MR.SMM must be written to ‘1’.
In Serial Memory mode, data is transferred only by writing or reading the QSPI memory space (0x80000000).