ATMEGA644P-A15MZ Atmel, ATMEGA644P-A15MZ Datasheet - Page 369

• Manufacturer Part Number: ATMEGA644P-A15MZ
• Description: MCU AVR 64KB FLASH 16MHZ 44QFN
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA644P-A15MZ

• Package / Case: 44-VQFN Exposed Pad
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 125°C
• Speed: 16MHz
• Number Of I /o: 32
• Eeprom Size: 2K x 8
• Core Processor: AVR
• Program Memory Type: FLASH
• Ram Size: 4K x 8
• Program Memory Size: 64KB (64K x 8)
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Connectivity: I²C, SPI, UART/USART
• Core Size: 8-Bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

36. Table of Contents
7674F–AVR–09/09
1
2
3
4
5
6
7
Features ..................................................................................................... 1
Pin Configurations ................................................................................... 2
Overview ................................................................................................... 3
Resources ................................................................................................. 7
About Code Examples ............................................................................. 8
AVR CPU Core .......................................................................................... 9
AVR Memories ........................................................................................ 18
System Clock and Clock Options ......................................................... 29
2.1
2.2
2.3
5.1
5.2
5.3
5.4
5.5
5.6
5.7
6.1
6.2
6.3
6.4
6.5
6.6
7.1
7.2
7.3
7.4
7.5
7.6
7.7
7.8
Block Diagram ...................................................................................................3
Comparison Between ATmega164P, ATmega324P and ATmega644P ...........4
Pin Descriptions .................................................................................................5
Overview ............................................................................................................9
ALU – Arithmetic Logic Unit .............................................................................10
Status Register ................................................................................................11
General Purpose Register File ........................................................................12
Stack Pointer ...................................................................................................13
Instruction Execution Timing ...........................................................................14
Reset and Interrupt Handling ...........................................................................15
Overview ..........................................................................................................18
In-System Reprogrammable Flash Program Memory .....................................18
SRAM Data Memory ........................................................................................19
EEPROM Data Memory ..................................................................................21
I/O Memory ......................................................................................................22
Register Description ........................................................................................23
Clock Systems and their Distribution ...............................................................29
Clock Sources .................................................................................................30
Low Power Crystal Oscillator ...........................................................................32
Full Swing Crystal Oscillator ............................................................................33
Low Frequency Crystal Oscillator ....................................................................34
Calibrated Internal RC Oscillator .....................................................................36
128 kHz Internal Oscillator ..............................................................................37
External Clock .................................................................................................37
ATmega164P/324P/644P
369