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AVR64DU28/32 Preliminary Data Sheet
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AVR64DU28
AVR64DU32
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12
CLKCTRL - Clock Controller
12.3
Functional Description
Introduction
Features
AVR® DU
Family Overview
Security Concept
1
Block Diagram
2
Pinout
3
I/O Multiplexing and Considerations
4
Conventions
5
Hardware Guidelines
6
Power Supply
7
AVR® CPU
8
Memories
9
Peripherals and Architecture
10
GPR - General Purpose Registers
11
NVMCTRL - Nonvolatile Memory Controller
12
CLKCTRL - Clock Controller
12.1
Features
12.2
Overview
12.3
Functional Description
12.3.1
Initialization
12.3.2
Main Clock Selection and Prescaler
12.3.3
Main Clock After Reset
12.3.4
Clock Sources
12.3.5
Tuning the Internal High-Frequency Oscillator
12.3.6
Clock Failure Detection (CFD)
12.3.7
Interrupts
12.3.8
Sleep Mode Operation
12.3.9
Configuration Change Protection (CCP)
12.4
Register Summary
12.5
Register Description
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
RTC - Real-Time Counter
23
TCA - 16-bit Timer/Counter Type A
24
TCB - 16-Bit Timer/Counter Type B
25
USART - Universal Synchronous and Asynchronous Receiver and Transmitter
26
SPI - Serial Peripheral Interface
27
TWI - Two-Wire Interface
28
USB - Universal Serial Bus Device Controller
29
CRCSCAN - Cyclic Redundancy Check Memory Scan
30
CCL - Configurable Custom Logic
31
AC - Analog Comparator
32
ADC - Analog-to-Digital Converter
33
UPDI - Unified Program and Debug Interface
34
Instruction Set Summary
35
Ordering Information
36
Package Drawings
37
Electrical Characteristics
38
Characteristics Graphs
39
Data Sheet Revision History
Microchip Information
12.3 Functional Description
