ATmega644P Automotive Atmel Corporation, ATmega644P Automotive Datasheet - Page 369

• Manufacturer Part Number: ATmega644P Automotive
• Manufacturer: Atmel Corporation

Specifications of ATmega644P Automotive

• Flash (kbytes): 64 Kbytes
• Pin Count: 44
• Max. Operating Frequency: 16 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 125
• I/o Supply Class: 2.7 to 5.5
• Operating Voltage (vcc): 2.7 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

36. Table of Contents
7674F–AVR–09/09
1
2
3
4
5
6
7
Features ..................................................................................................... 1
Pin Configurations ................................................................................... 2
Overview ................................................................................................... 3
Resources ................................................................................................. 7
About Code Examples ............................................................................. 8
AVR CPU Core .......................................................................................... 9
AVR Memories ........................................................................................ 18
System Clock and Clock Options ......................................................... 29
2.1
2.2
2.3
5.1
5.2
5.3
5.4
5.5
5.6
5.7
6.1
6.2
6.3
6.4
6.5
6.6
7.1
7.2
7.3
7.4
7.5
7.6
7.7
7.8
Block Diagram ...................................................................................................3
Comparison Between ATmega164P, ATmega324P and ATmega644P ...........4
Pin Descriptions .................................................................................................5
Overview ............................................................................................................9
ALU – Arithmetic Logic Unit .............................................................................10
Status Register ................................................................................................11
General Purpose Register File ........................................................................12
Stack Pointer ...................................................................................................13
Instruction Execution Timing ...........................................................................14
Reset and Interrupt Handling ...........................................................................15
Overview ..........................................................................................................18
In-System Reprogrammable Flash Program Memory .....................................18
SRAM Data Memory ........................................................................................19
EEPROM Data Memory ..................................................................................21
I/O Memory ......................................................................................................22
Register Description ........................................................................................23
Clock Systems and their Distribution ...............................................................29
Clock Sources .................................................................................................30
Low Power Crystal Oscillator ...........................................................................32
Full Swing Crystal Oscillator ............................................................................33
Low Frequency Crystal Oscillator ....................................................................34
Calibrated Internal RC Oscillator .....................................................................36
128 kHz Internal Oscillator ..............................................................................37
External Clock .................................................................................................37
ATmega164P/324P/644P
369