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nambip2
Visitor II
April 25, 2005
Question

I/O State

  • April 25, 2005
  • 2 replies
  • 863 views
Posted on April 25, 2005 at 05:03

I/O State

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    2 replies

    N
    nambip2Author
    Visitor II
    April 20, 2005
    Posted on April 20, 2005 at 18:12

    In ST7FLITE09 , after power up how long does it take for the configuration of the I/O when i use the internal RC oscillator ? In my application i like to configure the I/O as O/P .

    1. From power up until configuration of the I/O as O/P what will be the state of the I/O Pin.will this be high impedance / low / high ?

    2 .From power up to valid output (I/O config.) what is the time taken ?

    Thanks

    Prasanna

    A
    alok2
    Visitor II
    April 25, 2005
    Posted on April 25, 2005 at 05:03

    This is explained in datasheet. See Reset Sequence Manager chapter.

    To answer a bit..

    1. Startup time of micro : 256 cyc + PLL startup time (60 cyc) + S/w initialisation time if taken by compiler library (e.g startup.o)

    2. I/o are in floating i/p = high impedance

    3. once the mcu has started, you can put 1st instruction for IO initialisations.

    hope it helps.

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