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Table of Contents
Introduction......................................................................................................................1
Feature............................................................................................................................ 1
1. Description.................................................................................................................9
2. Configuration Summary...........................................................................................10
3. Ordering Information ............................................................................................... 11
3.1. ATmega328 ............................................................................................................................... 11
3.2. ATmega328P .............................................................................................................................12
4. Block Diagram......................................................................................................... 13
5. Pin Configurations................................................................................................... 14
5.1. Pin-out........................................................................................................................................ 14
5.2. Pin Descriptions..........................................................................................................................17
6. I/O Multiplexing........................................................................................................19
7. Resources................................................................................................................21
8. Data Retention.........................................................................................................22
9. About Code Examples.............................................................................................23
10. Capacitive Touch Sensing....................................................................................... 24
10.1. QTouch Library........................................................................................................................... 24
11. AVR CPU Core........................................................................................................ 25
11.1. Overview.....................................................................................................................................25
11.2. ALU – Arithmetic Logic Unit........................................................................................................26
11.3. Status Register...........................................................................................................................26
11.4. General Purpose Register File................................................................................................... 28
11.5. Stack Pointer.............................................................................................................................. 29
11.6. Instruction Execution Timing...................................................................................................... 31
11.7. Reset and Interrupt Handling..................................................................................................... 32
12. AVR Memories.........................................................................................................34
12.1. Overview.....................................................................................................................................34
12.2. In-System Reprogrammable Flash Program Memory................................................................34
12.3. SRAM Data Memory...................................................................................................................35
12.4. EEPROM Data Memory............................................................................................................. 36
12.5. I/O Memory.................................................................................................................................37
12.6. Register Description................................................................................................................... 38
13. System Clock and Clock Options............................................................................ 48

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