ATMEGA644PA-AU Atmel, ATMEGA644PA-AU Datasheet - Page 81

• Manufacturer Part Number: ATMEGA644PA-AU
• Description: IC MCU 8BIT 64KB FLASH 44TQFP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA644PA-AU

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 32
• 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: 44-TQFP, 44-VQFP
• Processor Series: ATMEGA64x
• Core: AVR8
• Data Bus Width: 8 bit
• Data Ram Size: 4 KB
• Interface Type: SPI, TWI, UART
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 32
• Operating Supply Voltage: 1.8 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: EWAVR, EWAVR-BL
• Development Tools By Supplier: ATAVRDRAGON, ATSTK500, ATSTK600, ATAVRISP2, ATAVRONEKIT
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

13.3.1
8272A–AVR–01/10
Alternate Functions of Port A
The Port A pins with alternate functions are shown in
Table 13-3.
• ADC7:0/PCINT7:0 – Port A, Bit 7:0
ADC7:0, Analog to Digital Converter, Channels 7:0
PCINT7:0, Pin Change Interrupt source 7:0: The PA7:0 pins can serve as external interrupt
sources.
164A/164PA/324A/324PA/644A/644PA/1284/1284P
Port Pin
PA7
PA6
PA5
PA4
PA3
PA2
PA1
PA0
Port A Pins Alternate Functions
Alternate Function
ADC7 (ADC input channel 7)
PCINT7 (Pin Change Interrupt 7)
ADC6 (ADC input channel 6)
PCINT6 (Pin Change Interrupt 6)
ADC5 (ADC input channel 5)
PCINT5 (Pin Change Interrupt 5)
ADC4 (ADC input channel 4)
PCINT4 (Pin Change Interrupt 4)
ADC3 (ADC input channel 3)
PCINT3 (Pin Change Interrupt 3)
ADC2 (ADC input channel 2)
PCINT2 (Pin Change Interrupt 2)
ADC1 (ADC input channel 1)
PCINT1 (Pin Change Interrupt 1)
ADC0 (ADC input channel 0)
PCINT0 (Pin Change Interrupt 0)
.
Table
13-3.
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