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AVR32SD20/28/32 Preliminary Data Sheet
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AVR32SD20
AVR32SD28
AVR32SD32
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18
CLKCTRL - Clock Controller
18.3
Functional Description
Introduction
Features
AVR® SD
Family Overview
1
Functional Safety Concept
2
Security Concept
3
Block Diagram
4
Pinout
5
I/O Multiplexing and Considerations
6
Hardware Guidelines
7
Power Supply
8
Conventions
9
BOOTROM - Boot ROM Code
10
AVR® CPU
11
BUSMATRIX - Bus Matrix
12
Memories
13
Peripherals and Architecture
14
Getting Started with Software Development
15
GPR - General Purpose Registers
16
NVMCTRL - Nonvolatile Memory Controller
17
RAMCTRL - RAM Controller
18
CLKCTRL - Clock Controller
18.1
Features
18.2
Overview
18.3
Functional Description
18.3.1
Initialization
18.3.2
Main Clock Selection and Prescaler
18.3.3
Main Clock After Reset
18.3.4
Clock Sources
18.3.5
Phase-Locked Loop (PLL)
18.3.6
OSC600K - Internal 600 kHz Oscillator
18.3.7
Manual Tuning and Auto-Tune
18.3.8
TIMEBASE
18.3.9
Clock Failure Detection (CFD)
18.3.10
Clock Frequency Measurement (CFM)
18.3.11
Typical Configurations for CFD and CFM
18.3.12
Interrupts
18.3.13
Sleep Mode Operation
18.3.14
Configuration Change Protection (CCP)
18.4
Register Summary
18.5
Register Description
19
SLPCTRL - Sleep Controller
20
RSTCTRL - Reset Controller
21
CPUINT - CPU Interrupt Controller
22
ERRCTRL - Error Controller
23
EVSYS - Event System
24
PORTMUX - Port Multiplexer
25
PORT - I/O Pin Configuration
26
MVIO - Multi-Voltage I/O
27
BOD - Brown-out Detector
28
VREF - Voltage Reference
29
WDT - Watchdog Timer
30
SWDT - Synchronous Watchdog Timer
31
TCA - 16-bit Timer/Counter Type A
32
TCB - 16-Bit Timer/Counter Type B
33
TCD - 12-Bit Timer/Counter Type D
34
RTC - Real-Time Counter
35
USART - Universal Synchronous and Asynchronous Receiver and Transmitter
36
SPI - Serial Peripheral Interface
37
TWI - Two-Wire Interface
38
CRCSCAN - Cyclic Redundancy Check Memory Scan
39
CCL - Configurable Custom Logic
40
AC - Analog Comparator
41
ADC - Analog-to-Digital Converter
42
DAC - Digital-to-Analog Converter
43
ZCD - Zero-Cross Detector
44
UPDI - Unified Program and Debug Interface
45
Instruction Set Summary
46
Electrical Characteristics
47
Characteristics Graphs
48
Ordering Information
49
Package Drawings
50
Data Sheet Revision History
Microchip Information
18.3 Functional Description
