ATmega644P Atmel Corporation, ATmega644P Datasheet - Page 432

• 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

8011O–AVR–07/10
7
8
9
Power Management and Sleep Modes ................................................. 42
System Control and Reset .................................................................... 50
Interrupts ................................................................................................ 61
6.5 Low Frequency Crystal Oscillator ...........................................................................34
6.6 Calibrated Internal RC Oscillator ............................................................................36
6.7 128 kHz Internal Oscillator .....................................................................................37
6.8 External Clock ........................................................................................................37
6.9 Timer/Counter Oscillator ........................................................................................38
6.10 Clock Output Buffer ..............................................................................................38
6.11 System Clock Prescaler .......................................................................................38
6.12 Register Description .............................................................................................40
7.1 Overview ................................................................................................................42
7.2 Sleep Modes ..........................................................................................................42
7.3 BOD Disable ...........................................................................................................43
7.4 Idle Mode ................................................................................................................43
7.5 ADC Noise Reduction Mode ..................................................................................43
7.6 Power-down Mode .................................................................................................44
7.7 Power-save Mode ..................................................................................................44
7.8 Standby Mode ........................................................................................................44
7.9 Extended Standby Mode ........................................................................................44
7.10 Power Reduction Register ....................................................................................45
7.11 Minimizing Power Consumption ...........................................................................45
7.12 Register Description .............................................................................................47
8.1 Resetting the AVR ..................................................................................................50
8.2 Reset Sources ........................................................................................................50
8.3 Power-on Reset ......................................................................................................51
8.4 External Reset ........................................................................................................52
8.5 Brown-out Detection ...............................................................................................53
8.6 Watchdog Reset .....................................................................................................53
8.7 Internal Voltage Reference .....................................................................................54
8.8 Watchdog Timer .....................................................................................................55
8.9 Register Description ...............................................................................................58
9.1 Overview ................................................................................................................61
9.2 Interrupt Vectors in ATmega164P/324P/644P .......................................................61
9.3 Register Description ...............................................................................................65
ATmega164P/324P/644P
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