ATMEGA329P-20MN Atmel, ATMEGA329P-20MN Datasheet - Page 420

• Manufacturer Part Number: ATMEGA329P-20MN
• Description: IC MCU AVR 32K 20MHZ 64QFN
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA329P-20MN

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: SPI, UART/USART, USI
• Peripherals: Brown-out Detect/Reset, LCD, POR, PWM, WDT
• Number Of I /o: 54
• Program Memory Size: 32KB (16K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 1K x 8
• Ram Size: 2K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-MLF®, 64-QFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Table of Contents
8021G–AVR–03/11
1
2
3
4
5
6
7
8
Features ..................................................................................................... 1
Pin Configurations ................................................................................... 2
Overview ................................................................................................... 4
Resources ................................................................................................. 9
Data Retention .......................................................................................... 9
About Code Examples ............................................................................. 9
AVR CPU Core ........................................................................................ 10
AVR Memories ........................................................................................ 18
System Clock and Clock Options ......................................................... 27
2.1Block Diagram ...........................................................................................................4
2.2Comparison between ATmega329P, and ATmega3290P. ........................................5
2.3Pin Descriptions ........................................................................................................6
6.1Overview .................................................................................................................10
6.2Architectural Overview ............................................................................................10
6.3ALU – Arithmetic Logic Unit ....................................................................................11
6.4AVR Status Register ...............................................................................................11
6.5General Purpose Register File ................................................................................13
6.6Stack Pointer ...........................................................................................................14
6.7Instruction Execution Timing ...................................................................................15
6.8Reset and Interrupt Handling ..................................................................................16
7.1Overview .................................................................................................................18
7.2In-System Reprogrammable Flash Program Memory .............................................18
7.3SRAM Data Memory ...............................................................................................18
7.4EEPROM Data Memory ..........................................................................................20
7.5I/O Memory ..............................................................................................................21
7.6Register Description ................................................................................................22
8.1Clock Systems and their Distribution .......................................................................27
8.2Clock Sources .........................................................................................................28
8.3Default Clock Source ...............................................................................................28
8.4Crystal Oscillator .....................................................................................................29
8.5Low-frequency Crystal Oscillator .............................................................................30
8.6Calibrated Internal RC Oscillator .............................................................................31
ATmega329P/3290P
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