35.6.2.1 Changing QSPI_IFR Configuration (QSPI_MR.SMM = 1)

Accesses in Serial Memory mode (QSPI_MR.SMM=1) are triggered by QSPI register accesses or by performing accesses in the QSPI memory space depending on the configuration of QSPI_IFR.SMRM and QSPI_IFR.TFRTYP. For details, see Instruction Frame and QSPI Access Triggering.

If QSPI_IFR is to be modified after the initial configuration, the procedure illustrated in the figure below must be followed to ensure no frame loss. For details, see QSPI Access Triggering.