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Answer The operating voltage range of a standard SPI Flash Memory is 2.7V~3.6V. If the system voltage is 5.0V, an external LDO (ex. HT7133-1/HT7533-1) will be required to connect the LCD 3.3V output to the VCCA5 pin so that the SPI output level will be able to control the external SPI Flash Memory.
