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LM4F232: Realizing a 1.832MHz frequency

Abhed Misra
Genius 13805 points

LM4F232: How Can I get a frequency out of 1.8432 MHz ? What should be the cpu frequency for this ?

  • 0
    Guru 86755 points

    Abhed,

         I don't think 1.8432 Mhz crystal value is supported by your processor. Check your processor datasheet under "Fundamental Clock Sources".

    - kel

  • 0
    Guru 47900 points

    Agree w/poster Markel - "if" he's guessed correctly regarding just what you're asking.  (your question is unclear)

    Should you - instead - seek to have the MCU generate a 1.8432 MHz output signal - the old stand-by would be to select an integer multiple of this 1.8 MHz frequency for your MCU's main oscillator xtal.  Readily available - valid xtals include: 7.3728 & 14.7456.  Higher frequencies may run afoul of the MCU's upper frequency, xtal limit.  (your datasheet will detail)

    After choosing/installing the proper xtal - use of one of the many timers of the M4F can output your desired frequency  (and many others - should you desire) onto your choice of GPIO pin - under timer-interrupt control.  (simply toggle that GPIO w/in your short timer interrupt routine)