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terryhao
Visitor II
November 22, 2002
Question

ST7lite05 external clock connection?

  • November 22, 2002
  • 3 replies
  • 929 views
Posted on November 22, 2002 at 15:46

ST7lite05 external clock connection?

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    3 replies

    T
    terryhaoAuthor
    Visitor II
    November 22, 2002
    Posted on November 22, 2002 at 01:48

    I want to use a crystal oscillator in ST7lite05. But I don't know how to connect? Could you give me a hand?

    Terry Hao

    terryhao@citiz.net

    P
    p239955_stm1_stmicro_com
    Visitor II
    November 22, 2002
    Posted on November 22, 2002 at 09:00

    ST7Flite0 has been specifically designed to be used with the embedded internal 1% RC. Therefore crystal isn't expected to be used with this device and no dedicated pins are available.

    Feel free to use the internal RC + PLLx4x8 to reach your CPU frequency: 1, 4, or 8MHz.

    Pierre
    M
    maxime2399
    Visitor II
    November 22, 2002
    Posted on November 22, 2002 at 15:46

    The lite05 cannot drive a crystal directly but can accept a logic CMOS level Clock. In this configuration you can either use an external clock chip or build your own using inverters.

    I found the enclosed application note from Epson very useful for my own oscillator design.

    ________________

    Attachments :

    O_D_guide.pdf : https://st--c.eu10.content.force.com/sfc/dist/version/download/?oid=00Db0000000YtG6&ids=0680X000006I02K&d=%2Fa%2F0X0000000bU0%2FtuVXXrojKuDMr8.b5N0epK9VCsz8bgPNdzpgnVH6n1U&asPdf=false
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