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12 CLKCTRL - Clock Controller
12.5 Register Description

Introduction
Family Overview
Features
1 Block Diagram
2 Pinout
3 I/O Multiplexing and Considerations
4 Hardware Guidelines
5 Power Domains
6 Conventions
7 AVR® CPU
8 Memories
9 GPR - General Purpose Registers
10 Peripherals and Architecture
11 NVMCTRL - Nonvolatile Memory Controller
12 CLKCTRL - Clock Controller
- 12.1 Features
- 12.2 Overview
- 12.3 Functional Description
- 12.4 Register Summary
- 12.5 Register Description
  - 12.5.1 Main Clock Control A
    Main Clock Control A
  - 12.5.2 Main Clock Control B
    Main Clock Control B
  - 12.5.3 Main Clock Status
    Main Clock Status
  - 12.5.4 Timebase
    Timebase
  - 12.5.5 Internal High-Frequency Oscillator Control A
    Internal High-Frequency Oscillator Control A
  - 12.5.6 Internal High-Frequency Oscillator Frequency Tune
    Internal High-Frequency Oscillator Frequency Tune
  - 12.5.7 Internal 32.768 kHz Oscillator Control A
    Internal 32.768 kHz Oscillator Control A
  - 12.5.8 External 32.768 kHz Crystal Oscillator Control A
    External 32.768 kHz Crystal Oscillator Control A
  - 12.5.9 PLL Control A
    PLL Control A
  - 12.5.10 PLL Control B
    PLL Control B
13 SLPCTRL - Sleep Controller
14 RSTCTRL - Reset Controller
15 CPUINT - CPU Interrupt Controller
16 EVSYS - Event System
17 PORTMUX - Port Multiplexer
18 PORT - I/O Pin Configuration
19 BOD - Brown-out Detector
20 VREF - Voltage Reference
21 WDT - Watchdog Timer
22 TCB - 16-Bit Timer/Counter Type B
23 TCE - 16-Bit Timer/Counter Type E
24 WEX - Waveform Extension for the 16-Bit Timer/Counter Type E
25 TCF - 24-bit Timer/Counter Type F
26 RTC - Real-Time Counter
27 USART - Universal Synchronous and Asynchronous Receiver and Transmitter
28 SPI - Serial Peripheral Interface
29 TWI - Two-Wire Interface
30 CRCSCAN - Cyclic Redundancy Check Memory Scan
31 CCL - Configurable Custom Logic
32 AC - Analog Comparator
33 ADC - Analog-to-Digital Converter
34 UPDI - Unified Program and Debug Interface
35 Instruction Set Summary
36 Electrical Characteristics
37 Characteristics Graphs
38 Ordering Information
39 Packaging Information
40 Data Sheet Revision History
Microchip Information