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Atmega Speeds

Discussion in 'Arduino' started by Wp100, May 18, 2018 at 1:42 AM.

  1. Wp100

    Wp100 Active Member

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    Hi,

    There are several atmega chips used with Arduino, the 328, 324, 1284,2560.

    Generally lead to believe the 2560 is bigger and faster, yet looking at the specs they all state 1mips per 1mhz, so are they really all the same speed or are we missing some key point ?
     
  2. Pommie

    Pommie Well-Known Member Most Helpful Member

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    They are all 1mips per MHz but they run at different MHz. Depending of the board it's either 8 or 16 MHz. Some of the other compatible boards (not atmega) run much faster - Arduino Due = 84MHz. Wemos = 80/160 MHz. The Wemos mini is one of my favourites due to built in wifi and they cost me around US$5.

    Mike.
     
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  3. wkrug

    wkrug Active Member

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    Some Assembler Instructions of an AVR need more then 1 Clock.
    Which they are You can see in in Chapter Instructions of the choosen AVR Datasheet.
    The maximum clock speed depends from supply voltage and the choosen controller Type.
    A-Types often go up to 20MHz Controller Clock at 5V supply.

    You have to look very close which type works with the target clock speed of Your application.
    The differnce can be only 1 character.

    At an Arduino Board the voltage and clock is fixed, so there should be no troubles.
     

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