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E
ea
Visitor II
October 3, 2007
Question

Why must ICCSEL/VPP Pin of ST7 be connected to pull down 10Kohm?

  • October 3, 2007
  • 3 replies
  • 866 views
Posted on October 04, 2007 at 00:02

Why must ICCSEL/VPP Pin of ST7 be connected to pull down 10Kohm?

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    3 replies

    E
    eaAuthor
    Visitor II
    October 3, 2007
    Posted on October 03, 2007 at 08:59

    Hi,

    I am using ST7F324L MCU for my appilcation. I see that it is ICCSEL/VPP Pin be connected to pull down 10Kohm.

    Like to know the reason for this and the effect for leaving ICCSEL/VPP pin floating.

    Thanks.

    F
    fggnrc
    Visitor II
    October 3, 2007
    Posted on October 03, 2007 at 10:07

    Hi kea

    ICCSEL/VPP must be PULLED UP by a 10 kOhm resistor to avoid entering in circuit programmig (ICP) during a reset.

    This is a safety measure, because after a reset this pin, if not fixed to Vdd, may float and therefore start an unwanted ICP session.

    Regards,

    EtaPhi

    E
    eaAuthor
    Visitor II
    October 3, 2007
    Posted on October 04, 2007 at 00:02

    Hi EtaPhi,

    I am clear now. Thanks for your reply.

    Thanks,

    kea

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