ATMEGA644-20MU

ATMEL  ATMEGA644-20MU  微控制器, 8位, 低功率高性能, ATmega, 20 MHz, 64 KB, 4 KB, 44 引脚, VQFN

The is a high-performance, low-power 8-bit AVR RISC-based Microcontroller combines 64kB ISP flash memory with read-while-write capabilities, 2kB EEPROM, 4kB SRAM, 32 general purpose I/O lines, 32 general purpose working registers, real time counter, three flexible timers/counters with compare modes and PWM, 2 USARTs, byte oriented 2-wire serial interface, 8-channel/10-bit A/D converter with optional differential input stage with programmable gain, programmable watchdog timer with internal oscillator, SPI serial port, JTAG IEEE 1149.1 compliant test interface for on-chip debugging and six software selectable power saving modes. The device operates between 2.7 to 5.5V. By executing powerful instructions in a single clock-cycle, the device achieves throughputs approaching 1MIPS per MHz, balancing power consumption and processing speed.

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Advanced RISC architecture

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Power-on reset and programmable brown-out detection

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Internal calibrated RC oscillator

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External and internal interrupt sources

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Six sleep modes - idle, ADC noise reduction, power-save, power-down, standby and extended standby

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131 Powerful instructions-most single clock cycle execution

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32 x 8 General purpose working registers

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Fully static operation

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Up to 20MIPS throughput at 20MHz

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JTAG IEEE std. 1149.1 compliant interface

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Programmable watchdog timer with separate on-chip oscillator

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On-chip analog comparator

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Interrupt and wake-up on pin change

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Two 8-bit timers/counters with separate prescaler and compare mode

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One 16-bit timer/counter with separate prescaler, compare mode and capture mode

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Real-time counter with separate oscillator

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Six PWM channels

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One programmable serial USART

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Master/Slave SPI serial interface