ATMEGA645A-AU Atmel, ATMEGA645A-AU Datasheet - Page 6

• Manufacturer Part Number: ATMEGA645A-AU
• Description: IC MCU AVR 64K FLASH 64TQFP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA645A-AU

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: SPI, UART/USART, USI
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 54
• Program Memory Size: 64KB (32K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 2K x 8
• Ram Size: 4K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-TQFP
• Processor Series: ATmega
• Core: AVR
• Data Bus Width: 8 bit
• Data Ram Size: 4 KB
• Interface Type: SPI, USART
• Maximum Clock Frequency: 16 MHz
• Number Of Programmable I/os: 54
• Number Of Timers: 3
• Operating Supply Voltage: 3.3 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Operating Temperature Range: - 40 C to + 85 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

2.2
Table 2-1.
2.3
2.3.1
2.3.2
2.3.3
2.3.4
6
Comparison Between
ATmega165A/165PA/325A/325PA/3250A/3250PA/645A/645P/6450A/6450P
Pin Descriptions
ATmega165A/165PA/325A/325PA/3250A/3250PA/645A/645P/645
VCC
GND
Port A (PA7:PA0)
Port B (PB7:PB0)
Differences between: ATmega165A/165PA/325A/325PA/3250A/3250PA/645A/645P/6450A/6450P
Device
ATmega165A
ATmega165PA
ATmega325A
ATmega325PA
ATmega3250A
ATmega3250PA
ATmega645A
ATmega645P
ATmega6450A
ATmega6450P
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.
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
nate Functions of Port B” on page
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.
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
nate Functions of Port B” on page
Flash
16Kbyte
16Kbyte
32Kbyte
32Kbyte
32Kbytes
32Kbyte
64Kbyte
64Kbyte
64Kbyte
64Kbyte
76.
76.
EEPROM
512Bytes
512Bytes
1Kbyte
1Kbyte
1Kbyte
1Kbyte
2Kbyte
2Kbyte
2Kbyte
2Kbyte
RAM
1Kbyte
1Kbyte
2Kbyte
2Kbyte
2Kbyte
2 byte
4Kbyte
4Kbyte
4Kbyte
4Kbyte
MHz
16
16
20
20
20
20
16
16
20
20
8285B–AVR–03/11
”Alter-
”Alter-