ATmega644P Atmel Corporation, ATmega644P Datasheet - Page 433

• 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
10 External Interrupts ................................................................................. 67
11 I/O-Ports .................................................................................................. 72
12 8-bit Timer/Counter0 with PWM ............................................................ 93
13 16-bit Timer/Counter1 with PWM ........................................................ 111
14 8-bit Timer/Counter2 with PWM and Asynchronous Operation ...... 139
10.1 Overview ..............................................................................................................67
10.2 Register Description .............................................................................................67
11.1 Overview ..............................................................................................................72
11.2 Ports as General Digital I/O ..................................................................................73
11.3 Alternate Port Functions .......................................................................................78
11.4 Register Description .............................................................................................91
12.1 Features ...............................................................................................................93
12.2 Overview ..............................................................................................................93
12.3 Timer/Counter Clock Sources ..............................................................................94
12.4 Counter Unit .........................................................................................................94
12.5 Output Compare Unit ...........................................................................................95
12.6 Compare Match Output Unit .................................................................................97
12.7 Modes of Operation ..............................................................................................98
12.8 Timer/Counter Timing Diagrams ........................................................................102
12.9 Register Description ...........................................................................................104
13.1 Features .............................................................................................................111
13.2 Overview ............................................................................................................111
13.3 Accessing 16-bit Registers .................................................................................113
13.4 Timer/Counter Clock Sources ............................................................................116
13.5 Counter Unit .......................................................................................................117
13.6 Input Capture Unit ..............................................................................................118
13.7 Output Compare Units ........................................................................................120
13.8 Compare Match Output Unit ...............................................................................122
13.9 Modes of Operation ............................................................................................123
13.10 Timer/Counter Timing Diagrams ......................................................................130
13.11 Register Description .........................................................................................132
14.1 Features .............................................................................................................139
14.2 Overview ............................................................................................................139
14.3 Timer/Counter Clock Sources ............................................................................140
14.4 Counter Unit .......................................................................................................141
ATmega164P/324P/644P
iii