ATmega644P Atmel Corporation, ATmega644P Datasheet - Page 329

• Manufacturer Part Number: ATmega644P
• 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

25.2
8011O–AVR–07/10
Speed Grades
Maximum frequency is depending on V
mum Frequency vs. V
4.5V.
Figure 25-1. Maximum Frequency vs. V
Figure 25-2. Maximum Frequency vs. V
10 MHz
20 MHz
10 MHz
4 MHz
1.8V
2.7V
CC
curve is linear between 1.8V < V
Safe Operating Area
Safe Operating Area
2.7V
CC.
CC
CC
4.5V
As shown in
, ATmega164PV/ATmega324PV/ATmega644PV
, ATmega164P/324P/644P
ATmega164P/324P/644P
5.5V
Figure 25-1
CC
< 2.7V and between 2.7V < V
5.5V
and
Figure
25-2, the Maxi-
CC
329
<