ATMEGA1280V ATMEL [ATMEL Corporation], ATMEGA1280V Datasheet - Page 7

• Manufacturer Part Number: ATMEGA1280V
• Description: 8-bit Microcontroller with 64K/128K/256K Bytes In-System Programmable Flash
• Manufacturer: ATMEL [ATMEL Corporation]

Comparison Between ATmega1281/2561 and ATmega640/1280/2560
Table 2. Configuration Summary
Pin Descriptions
VCC
GND
Port A (PA7..PA0)
Port B (PB7..PB0)
Port C (PC7..PC0)
Port D (PD7..PD0)
2549KS–AVR–01/07
Device
ATmega640
ATmega1280
ATmega1281
ATmega2560
ATmega2561
128KB
128KB
256KB
256KB
Flash
64KB
EEPROM
4KB
4KB
4KB
4KB
4KB
Each device in the ATmega640/1280/1281/2560/2561 family differs only in memory size
and number of pins. Table 2 summarizes the different configurations for the six devices.
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 page 91.
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 page 92.
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 resistors are activated. The Port C pins are tri-stated when a reset
condition becomes active, even if the clock is not running.
P o r t
ATmega640/1280/1281/2560/2561 as listed on page 95.
Port D is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each
bit). The Port D output buffers have symmetrical drive characteristics with both high sink
and source capability. As inputs, Port D pins that are externally pulled low will source
C
a l s o
RAM
8KB
8KB
8KB
8KB
8KB
s e r v e s
Purpose I/O pins
ATmega640/1280/1281/2560/2561
General
86
86
54
86
54
t h e
f u n c t i o n s
16 bits resolution
PWM channels
12
12
12
6
6
o f
s p e c i a l
USARTs
Serial
f e a t u r e s
4
4
2
4
2
Channels
ADC
o f
16
16
16
8
8
t h e
7