ATMEGA6450SLASHV datasheet(6/347 Pages) ATMEL

6 / 347 page

ATmega325/3250/645/6450

2570A–AVR–09/04

Comparison between

ATmega325,

ATmega3250,

ATmega645 and

ATmega6450

The ATmega325, ATmega3250, ATmega645, and ATmega6450 differs only in memory

sizes, pin count and pinout. Table 1 on page 6 summarizes the different configurations

for the four devices.

Pin Descriptions

The following section describes the I/O-pin special functions.

Digital supply voltage.

GND

Ground.

Port A (PA7..PA0)

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.

Port B (PB7..PB0)

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.

Por t B also ser v es the fu nctio n s of va r i ou s sp ecia l f e a t ur es of t h e

ATmega325/3250/645/6450 as listed on page 59.

Port C (PC7..PC0)

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.

Port D (PD7..PD0)

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

current if the pull-up resistors are activated. The Port D pins are tri-stated when a reset

condition becomes active, even if the clock is not running.

Por t D also se rve s t h e fu nctio n s of var i ous sp ecia l fea t u r es of th e

ATmega325/3250/645/6450 as listed on page 62.

Port E (PE7..PE0)

Port E is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each

bit). The Port E output buffers have symmetrical drive characteristics with both high sink

and source capability. As inputs, Port E pins that are externally pulled low will source

Table 1. Configuration Summary

Device

Flash

EEPROM

RAM

General Purpose

I/O Pins

ATmega325

32K bytes

1K bytes

2K bytes

ATmega3250

32K bytes

1K bytes

2K bytes

ATmega645

64K bytes

2K bytes

4K bytes

ATmega6450

64K bytes

2K bytes

4K bytes

ATMEGA6450/V Datasheet(PDF) 6 Page - ATMEL Corporation

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