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

Posted on October 04, 2007 at 00:02

This topic has been closed for replies.

ea_itAuthor

Associate

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.

Associate III

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

ea_itAuthor

Associate

Posted on October 04, 2007 at 00:02

Hi EtaPhi,

I am clear now. Thanks for your reply.

Thanks,

kea

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