ATMEGA644P-20PQ Atmel, ATMEGA644P-20PQ Datasheet - Page 90

• Manufacturer Part Number: ATMEGA644P-20PQ
• Description: MCU AVR 64K FLASH 20MHZ 40-PDIP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA644P-20PQ

• 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): 2.7 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 40-DIP (0.600", 15.24mm)
• For Use With: ATSTK600 - DEV KIT FOR AVR/AVR32
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

8011O–AVR–07/10
Table 11-14. Overriding Signals for Alternate Functions in PD3:PD0
Note:
Signal Name
PUOE
PUOV
DDOE
DDOV
PVOE
PVOV
DIEOE
DIEOV
DI
AIO
1. When enabled, the 2-wire Serial Interface enables Slew-Rate controls on the output pins PD0
and PD1. This is not shown in this table. In addition, spike filters are connected between the
AIO outputs shown in the port figure and the digital logic of the TWI module.
PD3/INT1/TXD1/
PCINT27
TXEN1
0
TXEN1
1
TXEN1
TXD1
INT1 ENABLE
PCINT27 • PCIE3
1
INT1 INPUT
PCINT27 INPUT
–
PD2/INT0/RXD1/
PCINT26
PORTD2 • PUD
RXEN1
0
0
INT2 ENABLE
PCINT26 • PCIE3
1
INT0 INPUT
RXD1
PCINT26 INPUT
–
RXEN1
0
ATmega164P/324P/644P
PD1/TXD0/
PCINT25
TXEN0
0
TXEN0
1
TXEN0
TXD0
PCINT25 • PCIE3
1
PCINT25 INPUT
–
(1)
PD0/RXD0/
PCINT27
RXEN1
PORTD0 • PUD
RXEN1
0
0
0
PCINT24 • PCIE3
1
RXD0
PCINT24 INPUT
–
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