ATMEGA1281V ATMEL [ATMEL Corporation], ATMEGA1281V Datasheet - Page 7

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

2.2
Table 2-1.
2.3
2.3.1
2.3.2
2.3.3
2.3.4
2.3.5
2549NS–AVR–05/11
Device
ATmega1280
ATmega1281
ATmega2560
ATmega2561
ATmega640
Comparison Between ATmega1281/2561 and ATmega640/1280/2560
Pin Descriptions
VCC
GND
Port A (PA7..PA0)
Port B (PB7..PB0)
Port C (PC7..PC0)
Configuration Summary
128KB
128KB
256KB
256KB
Flash
64KB
Each device in the ATmega640/1280/1281/2560/2561 family differs only in memory size and
number of pins.
Digital supply voltage.
Ground.
Port A is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The
Port A output buffers have symmetrical drive characteristics with both high sink and source
capability. As inputs, Port A pins that are externally pulled low will source current if the pull-up
resistors are activated. The Port A pins are tri-stated when a reset condition becomes active,
even if the clock is not running.
P o r t A a l s o s e r v e s t h e f u n c t i o n s o f v a r i o u s s p e c i a l f e a t u r e s o f t h e
ATmega640/1280/1281/2560/2561 as listed on
Port B is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The
Port B output buffers have symmetrical drive characteristics with both high sink and source
capability. As inputs, Port B pins that are externally pulled low will source current if the pull-up
resistors are activated. The Port B pins are tri-stated when a reset condition becomes active,
even if the clock is not running.
Port B has better driving capabilities than the other ports.
P o r t B a l s o s e r v e s t h e f u n c t i o n s o f v a r i o u s s p e c i a l f e a t u r e s o f t h e
ATmega640/1280/1281/2560/2561 as listed on
Port C is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The
Port C output buffers have symmetrical drive characteristics with both high sink and source
capability. As inputs, Port C pins that are externally pulled low will source current if the pull-up
EEPROM
4KB
4KB
4KB
4KB
4KB
Table 2-1
RAM
8KB
8KB
8KB
8KB
8KB
summarizes the different configurations for the six devices.
Purpose I/O pins
ATmega640/1280/1281/2560/2561
General
86
86
54
86
54
page
page
16 bits resolution
PWM channels
78.
79.
12
12
12
6
6
USARTs
Serial
4
4
2
4
2
Channels
ADC
16
16
16
8
8
7