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Using a Hardware Module to Interface

From Microchip Technology, Inc.

The 25XXX series serial EEPROMs from Microchip
Technology support a half-duplex protocol that
functions on a master-slave paradigm that is ideally
suited to data stream applications. The bus is
controlled by the microcontroller (master), which
accesses the 25XXX serial EEPROM (slave) via a
simple Serial Peripheral Interface (SPI) compatible
serial bus. Bus signals required are a clock input (SCK)
plus separate data in (SI) and data out (SO) lines.
Access to the 25XXX serial EEPROM is controlled
through a Chip Select (CS) input. Maximum clock
frequencies range from 3 MHz to 20 MHz.
Communication to the 25XXX serial EEPROM

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EPROM
Erasable programmable read-only memory (EPROM) chips are programmable, reusable computer chips that can be erased using ultraviolet light and reprogrammed with a PROM programmer or PROM burner.
FLASH Memory Chips
FLASH memory chips offer extremely fast access times, low power consumption, and relative immunity to severe shock or vibration. They do not need a constant power supply to retain their data. 
SRAM Memory Chips
Static random access memory (SRAM) chips do not need to be refreshed like DRAM chips. This makes SRAM chips faster and more reliable.
Memory Chips
Memory chips are internal storage areas in computers. Although the term "memory chip" commonly refers to a computer's random access memory (RAM), this product area includes many different types of electronic data storage. Computer memory stores data electronically in cells. Without memory chips, a computer could not read programs or retain data.
EEPROM
Electrically erasable programmable read-only memory (EEPROM) chips are similar to PROM devices, but require only electricity to be erased.
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