I have a circuit in which one uses lpc1752 and at45db flash memory. My question is this flash memory connects to ic like bellow and its work. I want to know how it works and is they use spi or something else.
Hello Jahid Hasan
You can find detailed information about the SPI in the LPC1752 user guide under chapter 17. https://www.nxp.com/docs/en/user-guide/UM10360.pdf
For examples about the SPI, you can refer to the LPCOpen libraries LPCOpen Software for LPC17XX | NXP
Regarding the schematic the MOSI line of the MCU must be connected to the serial input of your device and SSEL is connected to the Chip Select.
Let me know if this is helpful, if you have more questions do not hesitate to ask me.