ATMEGA325V-8MI【PDF 26/29 页】IC AVR MCU 32K 8MHZ 64-QFN

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2570NS–AVR–05/11

ATmega325/3250/645/6450

2.2

Comparison between ATmega325, ATmega3250, ATmega645 and ATmega6450

The ATmega325, ATmega3250, ATmega645, and ATmega6450 differ only in memory sizes, pin

count and pinout. Table 2-1 on page 6 summarizes the different configurations for the four

devices.

2.3

Pin Descriptions

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

2.3.1

Digital supply voltage.

2.3.2

GND

Ground.

2.3.3

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.

2.3.4

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.

Po rt B al so se rve s t h e f u nct i o n s of va ri ou s spe c ial f e a t ur es of t h e At me l

ATmega325/3250/645/6450 as listed on page 68.

2.3.5

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.

Table 2-1.

Configuration Summary

Device

Flash

EEPROM

RAM

General Purpose

I/O Pins

ATmega325

32Kbytes

1Kbytes

2Kbytes

ATmega3250

32Kbytes

1Kbytes

2Kbytes

ATmega645

64Kbytes

2Kbytes

4Kbytes

ATmega6450

64Kbytes

2Kbytes

4Kbytes

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