ATmega644P Atmel Corporation, ATmega644P Datasheet - Page 90
ATmega644P
Manufacturer Part Number
ATmega644P
Description
Manufacturer
Atmel Corporation
Specifications of ATmega644P
Flash (kbytes)
64 Kbytes
Pin Count
44
Max. Operating Frequency
20 MHz
Cpu
8-bit AVR
# Of Touch Channels
16
Hardware Qtouch Acquisition
No
Max I/o Pins
32
Ext Interrupts
32
Usb Speed
No
Usb Interface
No
Spi
3
Twi (i2c)
1
Uart
2
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
8
Adc Resolution (bits)
10
Adc Speed (ksps)
15
Analog Comparators
1
Resistive Touch Screen
No
Temp. Sensor
No
Crypto Engine
No
Sram (kbytes)
4
Eeprom (bytes)
2048
Self Program Memory
YES
Dram Memory
No
Nand Interface
No
Picopower
Yes
Temp. Range (deg C)
-40 to 85
I/o Supply Class
1.8 to 5.5
Operating Voltage (vcc)
1.8 to 5.5
Fpu
No
Mpu / Mmu
no / no
Timers
3
Output Compare Channels
6
Input Capture Channels
1
Pwm Channels
6
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
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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
–
90
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