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ulivo15
Visitor II
July 21, 2004
Question

CPU Frequency. What is it?

  • July 21, 2004
  • 3 replies
  • 891 views
Posted on July 21, 2004 at 08:38

CPU Frequency. What is it?

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    3 replies

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    ulivo15Author
    Visitor II
    July 19, 2004
    Posted on July 19, 2004 at 07:08

    Pardon, i'm a beginner.

    The CPU Frequency is equal to the RC oscillator? (In the st7lite09 there is an internal RC Oscillator (1 MHz): is the CPU Frequency at 1 MHz?)

    I need a baud rate of 31250 with a st7lite09. I can make it with the SPR bits, but how to set the CPU Frequency?

    What are the ways to modify the CPU Frequency?

    I thank you - Grazie mille - Je vous remercie
    A
    anshul
    Visitor II
    July 20, 2004
    Posted on July 20, 2004 at 08:34

    Yes, you are perfectly right the CPU frequency is equal to the RC oscillator frequency and it will be 1 MHz in ST7FLite09 when you use the Internal RC oscillator tuned to 1MHz.

    In order to get a baud rate of 31250 you can use the Internal RC for 1MHz Fcpu and then select a /32 prescalar.

    A
    anshul
    Visitor II
    July 21, 2004
    Posted on July 21, 2004 at 08:38

    You can refer section on Internal RC adjustment on page 24 of Lite0 datasheet for a better understanding.

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