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ATMEGA644 Datasheet(PDF) 3 Page - ATMEL Corporation |
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ATMEGA644 Datasheet(HTML) 3 Page - ATMEL Corporation |
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3 / 374 page  3 2593L–AVR–02/07 ATmega644 1.1 Disclaimer Typical values contained in this datasheet are based on simulations and characterization of other AVR microcontrollers manufactured on the same process technology. Min and Max values will be available after the device is characterized. 2. Overview The ATmega644 is a low-power CMOS 8-bit microcontroller based on the AVR enhanced RISC architecture. By executing powerful instructions in a single clock cycle, the ATmega644 achieves throughputs approaching 1 MIPS per MHz allowing the system designer to optimize power consumption versus processing speed. 2.1 Block Diagram Figure 2-1. Block Diagram CPU GND VCC RESET Power Supervision POR / BOD & RESET Watchdog Oscillator Watchdog Timer Oscillator Circuits / Clock Generation XTAL1 XTAL2 PORT A (8) PORT D (8) PD7..0 PORT C (8) PC7..0 TWI SPI EEPROM JTAG 8bit T/C 0 8bit T/C 2 16bit T/C 1 SRAM FLASH USART 0 Internal Bandgap reference Analog Comparator A/D Converter PA7..0 PORT B (8) PB7..0 |
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