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dhorvath
Joined: 06 Oct 2004 Posts: 3
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PIC16F87-based project only works when ICD is plugged in |
Posted: Mon Feb 02, 2009 3:20 pm |
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I have a problem on a recently upgraded project where everything works fine as long as my ICD-U40 is plugged in, but as soon as it is removed the device stops working.
I have RB3,6,7 all dedicated to the ICSP port, and MCLR tied high through a 47K resistor, GND and VCC appear fine. Using the internal oscillator at 8 MHZ.
These seems like it must be something simple, but I'm stumped... what do I need to check for? |
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Ttelmah Guest
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Posted: Mon Feb 02, 2009 3:59 pm |
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Have you got the pull down resistor on B3?.
If you have the chip programmed for LVP (implied by using B3), this line _must_ be pulled down, for normal operation.
Section 15.18 of the data sheet, note 4.
Best Wishes |
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PCM programmer
Joined: 06 Sep 2003 Posts: 21708
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