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AVR® DB Family AVR64DB28/32/48/64

AVR64DB64 AVR64DB48 AVR64DB32 AVR64DB28

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12 CLKCTRL - Clock Controller
12.3 Functional Description
12.3.4 Clock Sources
12.3.4.2 External Clock Sources

AVR64DB28/32/48/64

Introduction
AVR® DB Family Overview
Features
1 Block Diagram
2 Pinout
3 I/O Multiplexing and Considerations
4 Hardware Guidelines
5 Power Supply
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
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 MVIO - Multi-Voltage I/O
20 BOD - Brown-out Detector
21 VREF - Voltage Reference
22 WDT - Watchdog Timer
23 TCA - 16-bit Timer/Counter Type A
24 TCB - 16-Bit Timer/Counter Type B
25 TCD - 12-Bit Timer/Counter Type D
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 DAC - Digital-to-Analog Converter
35 OPAMP - Analog Signal Conditioning
36 ZCD - Zero-Cross Detector
37 UPDI - Unified Program and Debug Interface
38 Instruction Set Summary
39 Electrical Characteristics
40 Characteristics Graphs
41 Ordering Information
42 Package Drawings
43 Data Sheet Revision History
Microchip Information

12.3.4.2 External Clock Sources

The available external clock sources are described in the following sections.

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