ATMEGA1281V ATMEL [ATMEL Corporation], ATMEGA1281V Datasheet - Page 5

• Manufacturer Part Number: ATMEGA1281V
• Description: 8-bit Atmel Microcontroller with 64K/128K/256K Bytes In-System Programmable Flash
• Manufacturer: ATMEL [ATMEL Corporation]

2. Overview
2.1
Figure 2-1.
2549NS–AVR–05/11
PG5..0
PC7..0
P A7..0
RESET
XTAL1
XTAL2
Block Diagram
VCC
GND
Block Diagram
NOTE:
Shaded parts only available
in the 100-pin version.
Complete functionality for
the ADC, T/C4, and T/C5 only
available in the 100-pin version.
POR / BOD &
Supervision
Generation
PORT A (8)
PORT G (6)
PORT C (8)
Watchdog
Watchdog
Oscillator
Oscillator
Circuits /
Power
RESET
Timer
Clock
The ATmega640/1280/1281/2560/2561 is a low-power CMOS 8-bit microcontroller based on the
AVR enhanced RISC architecture. By executing powerful instructions in a single clock cycle, the
ATmega640/1280/1281/2560/2561 achieves throughputs approaching 1 MIPS per MHz allowing
the system designer to optimize power consumption versus processing speed.
PORT F (8)
PORT D (8)
PF7..0
EEPROM
XRAM
PD7..0
JTAG
TWI
FLASH
SPI
PORT K (8)
PORT B (8)
ATmega640/1280/1281/2560/2561
PK7..0
PB7..0
Bandgap reference
Converter
Internal
A/D
CPU
8 bit T/C 0
SRAM
PORT J (8)
PORT H (8)
PH7..0
P J7..0
Comparator
Analog
16 bit T/C 1
16 bit T/C 3
16 bit T/C 5
16 bit T/C 4
8 bit T/C 2
PORT E (8)
PE7..0
PORT L (8)
PL7..0
USART 0
USART 1
USART 3
USART 2
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