Contents

Introduction 1. Glossary 2. Prerequisites 3. RTC - Real Time Counter 3.1. Overview 3.2. Features 3.3. Principle of Operation 3.3.1. 32-bit Counter (Mode0) 3.3.2. 16-bit Counter (Mode1) 3.3.3. Clock/Calendar (Mode2) 3.4. Clocks 3.5. Synchronization 4. Tamper Detection 4.1. Overview 4.2. Modes of Operation 4.2.1. Active Layer Protection 4.3. Debouncing Action 4.4. Timestamp 4.5. DMA Operation 4.6. Interrupts 4.7. Events 4.8. Sleep Mode Operation 5. Application Requirements 5.1. Hardware Requirements 5.2. Software Requirements 5.3. Creating a Sample Project using SAM L22 5.4. Terminal Window Setting 6. Application Demonstration 6.1. Overview 6.2. Application Flowchart 6.3. Configuration 6.3.1. RTC Configuration 6.3.2. Other Settings 6.4. Design Consideration 6.5. Test Procedure 6.5.1. OFF Mode 6.5.2. WAKE Mode 6.5.3. CAPTURE Mode 6.5.4. Read Tamper History 6.5.5. Erase Tamper History 6.6. Testing Active Layer Protection 7. Use Case: Tamper Detection 7.1. Physical Tampering 7.2. Magnetic Interference 7.3. Removing Wires 7.4. Phase Neutral Interchange 8. References 9. Revision History