ATMEGA3250A-AN 데이터 시트보기 (PDF) - Atmel Corporation

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ATMEGA3250A-AN

8-bit Atmel Microcontroller with 16/32/64KB In-System Programmable Flash

Atmel Corporation 

2.2 Comparison between Atmel

ATmega165A/165PA/325A/325PA/3250A/3250PA/645A/645P/6450A/6450P

Table 2-1.

Differences between: ATmega165A/165PA/325A/325PA/3250A/3250PA/645A/645P/6450A/6450P.

Device

Flash

EEPROM

RAM

MHz

ATmega165A

16Kbyte

512Bytes

1Kbyte

16

ATmega165PA

16Kbyte

512Bytes

1Kbyte

16

ATmega325A

32Kbyte

1Kbyte

2Kbyte

20

ATmega325PA

32Kbyte

1Kbyte

2Kbyte

20

ATmega3250A

32Kbytes

1Kbyte

2Kbyte

20

ATmega3250PA

32Kbyte

1Kbyte

2Kbyte

20

ATmega645A

64Kbyte

2Kbyte

4Kbyte

16

ATmega645P

64Kbyte

2Kbyte

4Kbyte

16

ATmega6450A

64Kbyte

2Kbyte

4Kbyte

20

ATmega6450P

64Kbyte

2Kbyte

4Kbyte

20

2.3 Pin descriptions

2.3.1 VCC

Digital supply voltage.

2.3.2 GND

Ground.

2.3.3 Port A (PA7:PA0)

2.3.4

Port A is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The Port A output buf-

fers 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 A also serves the functions of various special features of the

ATmega165A/165PA/325A/325PA/3250A/3250PA/645A/645P/6450A/6450P as listed on ”Alternate functions of

Port B” on page 68.

Port B (PB7:PB0)

2.3.5

Port B is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The Port B output buf-

fers 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.

Port B also serves the functions of various special features of the

ATmega165A/165PA/325A/325PA/3250A/3250PA/645A/645P/6450A/6450P as listed on ”Alternate functions of

Port B” on page 68.

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 buf-

fers have symmetrical drive characteristics with both high sink and source capability. As inputs, Port C pins that are

ATmega165A/PA/325A/PA/3250A/PA/645A/P/6450A/P [SUMMARY]

6

8285ES–AVR–02/2013

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