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KAVRCalc. Есть версия и для Linux и для Windows!
Возможности:
Baud Rate CalculatorActual baud, error rate, and character and bit timing.
Timer CalculatorAllows settting of prescaler, desired timing (in millseconds, microseconds, or Hertz), whether computing base rate or toggled [double frequency], showing compare values, actual rate, and error percentage, and timer overflow periods.
TWI CalculatorComputes TWI (I2C) frequencies based on register values as well as computing register values based on desired frequency.
Watchdog CalculatorComputes times for number of 128kHz watchdog cycles.
FMUL CalculatorComputes AVR fractional multiplications.
32-bit Number CalculatorConverts between decimal (integer and floating point), hexadecimal integers, and IEEE-754 floating point. Can switch between little and big endian formatting.
ASCII CalculatorComputes between character strings, ASCII hex, and binary values.