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

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.
- 4.1 BOD - Brown-out Detector
- 4.2 CLKCTRL - Clock Controller
  - 4.2.1 CLKCTRL
  - 4.2.2 CLKCTRL with Auto-Tuning
    Clock Controller with Auto-Tuning for improved Internal Oscillator Accuracy
  - 4.2.3 CLKCTRL with Clock Failure Detection
    Clock Controller with Auto-tuning and Clock Failure Detection
- 4.3 Config Bits - Configuration Bits
- 4.4 CPU - Central Processor Unit
- 4.5 Interrupt Manager
- 4.6 Pin Manager
- 4.7 RSTCTRL - Reset Controller
- 4.8 SLPCTRL - Sleep Controller
- 4.9 System Manager
- 4.10 WDT - Watchdog Timer
5 Revision History
A concise summary of the changes for each version of the AVR API Reference.
Microchip Information

4.2.1 CLKCTRL

4.2.1.1 Introduction

The CLKCTRL controls, distributes and prescales the clock signals from the available oscillators. The CLKCTRL supports internal and external clock sources.

4.2.1.2 Supported Device Families


ATtiny	ATmega

4.2.1.3 Required header files:

#include "mcc_generated_files/system/clock.h"