To insert a reload configuration wait state, the SMC detects a write access to any SMC_MODE register of the user interface. If the user only modifies timing registers (SMC_SETUP, SMC_PULSE, SMC_CYCLE registers) in the user interface, he must validate the modification by writing the SMC_MODE, even if no change was made on the mode parameters.
The user must not change the configuration parameters of an SMC chip select (Setup, Pulse, Cycle, Mode) if accesses are performed on this CS during the modification. Any change of the chip select parameters, while fetching the code from a memory connected on this CS, may lead to unpredictable behavior. The instructions used to modify the parameters of an SMC chip select can be executed from the internal RAM or from a memory connected to another CS.