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5 System Drivers
Provides system level core functionality, like Clock, Interrupt, Pins. Some of these can be device dependent.
5.2 CLKCTRL - Clock Controller

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 Libraries
Software libraries which provide a complex set of functionalities, such as protocol support e.g., USB, TCP\IP, Data Streamer (Protocol) etc.
3 Drivers
Drivers provide a portable functional interface to the functionalities of the peripheral. Provides an API supporting peripheral functionality.
4 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.
5 System Drivers
Provides system level core functionality, like Clock, Interrupt, Pins. Some of these can be device dependent.
- 5.1 BOD - Brown-out Detector
- 5.2 CLKCTRL - Clock Controller
  - 5.2.1 CLKCTRL
  - 5.2.2 CLKCTRL with Auto-Tuning
    Clock Controller with Auto-Tuning for improved Internal Oscillator Accuracy
  - 5.2.3 CLKCTRL with Clock Failure Detection
    Clock Controller with Auto-tuning and Clock Failure Detection
- 5.3 Config Bits - Configuration Bits
- 5.4 CPU - Central Processor Unit
- 5.5 Interrupt Manager
- 5.6 Pin Manager
- 5.7 RSTCTRL - Reset Controller
- 5.8 SLPCTRL - Sleep Controller
- 5.9 System Manager
- 5.10 WDT - Watchdog Timer
6 Revision History
A concise summary of the changes for each version of the AVR API Reference.
Microchip Information

5.2 CLKCTRL - Clock Controller

The MPLAB® Code Configurator Melody Clock Controller (CLKCTRL) System Driver generates APIs to support Clock Controller-specific peripheral functionality on AVR 8-bit target MCUs.

CLKCTRL modules are categorized as follows:

Clock Controller
Clock Controller with Auto-tuning
Clock Controller with Clock Failure Detection