ATMEGA1281-16MU Atmel, ATMEGA1281-16MU Datasheet - Page 436

• Manufacturer Part Number: ATMEGA1281-16MU
• Description: IC MCU AVR 128K FLASH 64-QFN
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA1281-16MU

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: EBI/EMI, I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 54
• Program Memory Size: 128KB (64K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 4K x 8
• Ram Size: 8K 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
• Processor Series: ATMEGA128x
• Core: AVR8
• Data Bus Width: 8 bit
• Data Ram Size: 8 KB
• Interface Type: 2-Wire, SPI, UART
• Maximum Clock Frequency: 16 MHz
• Number Of Programmable I/os: 54
• Number Of Timers: 6
• Operating Supply Voltage: 4.5 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: EWAVR, EWAVR-BL
• Development Tools By Supplier: ATAVRDRAGON, ATSTK500, ATSTK600, ATAVRISP2, ATAVRONEKIT, ATAVRRZ541, ATAVRRAVEN, ATAVRRZRAVEN, ATAVRRZUSBSTICK, ATAVRISP2, ATAVRRZ201
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 8 channel
• For Use With: ATSTK600-TQFP64 - STK600 SOCKET/ADAPTER 64-TQFPATAVRDB101 - MODULE DISPLAY LCD/RGB BACKLIGHT770-1007 - ISP 4PORT ATMEL AVR MCU SPI/JTAGATAVRISP2 - PROGRAMMER AVR IN SYSTEMATJTAGICE2 - AVR ON-CHIP D-BUG SYSTEM
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Table of Contents
2549M–AVR–09/10
1
2
3
4
5
6
7
8
9
Features ..................................................................................................... 1
Pin Configurations ................................................................................... 2
Overview ................................................................................................... 5
Resources ............................................................................................... 11
About Code Examples ........................................................................... 11
Data Retention ........................................................................................ 11
AVR CPU Core ........................................................................................ 12
AVR Memories ........................................................................................ 21
External Memory Interface .................................................................... 28
System Clock and Clock Options ......................................................... 40
2.1
2.2
2.3
6.1
6.2
6.3
6.4
6.5
6.6
6.7
6.8
7.1
7.2
7.3
7.4
8.1
8.2
8.3
8.4
9.1
9.2
Block Diagram ...................................................................................................5
Comparison Between ATmega1281/2561 and ATmega640/1280/2560 ...........7
Pin Descriptions .................................................................................................7
Introduction ......................................................................................................12
Architectural Overview .....................................................................................12
ALU – Arithmetic Logic Unit .............................................................................13
Status Register ................................................................................................14
General Purpose Register File ........................................................................15
Stack Pointer ...................................................................................................16
Instruction Execution Timing ...........................................................................17
Reset and Interrupt Handling ...........................................................................18
In-System Reprogrammable Flash Program Memory .....................................21
SRAM Data Memory ........................................................................................21
EEPROM Data Memory ..................................................................................23
I/O Memory ......................................................................................................27
Overview ..........................................................................................................28
Register Description ........................................................................................35
General Purpose registers ...............................................................................37
External Memory registers ...............................................................................37
Overview ..........................................................................................................40
Clock Systems and their Distribution ...............................................................40
ATmega640/1280/1281/2560/2561
i