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3 PLIB Drivers
Peripheral Libraries (PLIB) may provide firmware portability, but in general provide only a non-portable interface to peripheral functionality, in the form of an API to support peripheral functionality.
3.13 SPI - Serial Peripheral Interface

1 MCC Melody API Reference for AVR® MCU Families
Lists the Libraries, Drivers, PLIB Drivers and System Drivers which support the 8-bit AVR families of microcontrollers in MCC Melody.
2 Drivers
Drivers provide a portable functional interface to the functionalities of the peripheral. Provides an API supporting peripheral functionality.
3 PLIB Drivers
Peripheral Libraries (PLIB) may provide firmware portability, but in general provide only a non-portable interface to peripheral functionality, in the form of an API to support peripheral functionality.
4 System Drivers
Provides system level core functionality, like Clock, Interrupt, Pins. Some of these can be device dependent.
5 Revision History
A concise summary of the changes for each version of the AVR API Reference.
Microchip Information

3.13 SPI - Serial Peripheral Interface

The MCC Melody SPI PLIB (Peripheral Library) Driver generates API to support basic Serial Peripheral Interface (SPI) functionality supporting both Host and Client, each with or without interrupts on AVR target MCUs.

In addition a portable API interface supports a generic SPI interface supporting the MCC Melody Component concepts of Firmware portability.

Related Technical Brief:

TB3215: Getting Started with Serial Peripheral Interface (SPI)This is the start of your concept.

SPIs are categorized as follows:

SPI
SPI with dedicated Control and Status Registers