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physical
The SPIFI peripheral is connected to the microcontroller's Application High-speed Bus, or AHB, which is used by the processor core and the on-chip memories. The CS pin is the Chip Select for the external Flash memory. If more than one serial Flash device is connected to the MCU, the Chip Select will be used in conjunction with general purpose I/Os. The I/O-2 and I/O-3 pins are only used if the external serial memory is a quad-type.
PTM Published on: 2011-04-29