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AVR32SD20/28/32 Preliminary Data Sheet
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AVR32SD20
AVR32SD28
AVR32SD32
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12
Memories
12.11
LOCK - Memory Sections Access Protection
12.11.2
Lock 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
12.1
Overview
12.2
Memory Map
12.3
In-System Reprogrammable Flash Program Memory
12.4
Program and Debug Interface Disable (PDID)
12.5
SRAM Data Memory
12.6
EEPROM Data Memory
12.7
SIGROW - Signature Row
12.8
BOOTROW - Boot Row
12.9
USERROW - User Row
12.10
FUSE - Configuration and User Fuses
12.11
LOCK - Memory Sections Access Protection
12.11.1
Lock Summary
12.11.2
Lock Description
12.11.2.1
Lock Key
Lock Key
12.12
I/O Memory
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
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
12.11.2 Lock Description
