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I have been trying to wire a PIC18f4620 to a FTD1232 using the MLCR reset. Below is my circuit. When I hit the reset, the short causes the processor and the FTD to lose power and I am unable to program to it. I am certain that this button to reset is possible, but I am unsure where I am going wrong.

Circuit image

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  • \$\begingroup\$ you can use a pullup resistor with a larger value. Try 10K. However, the 1K resistor should only pass 5mA when the switch is closed, so unless your power supply is extremely weak, I would seriously consider that something else might be wrong. \$\endgroup\$ – Math Keeps Me Busy Apr 10 at 22:47
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    \$\begingroup\$ Think you mean FTDIchip.com product such as ftdichip.com/products/ft232rq \$\endgroup\$ – MarkU Apr 10 at 23:09
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    \$\begingroup\$ Is it possible that the reset button is actually wired (not like in the diagram but really on the board) to the wrong side of the resistor? In that case pressing the button would directly short the 5V supply to ground, which matches the symptoms you describe \$\endgroup\$ – MarkU Apr 10 at 23:10
  • \$\begingroup\$ MarkU was correct! this has been resolved. \$\endgroup\$ – Petertk Apr 20 at 3:32
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The "FTD1232" is actually an FTDIchip.com product such as FT232.

Also, it is possible that the reset button is actually wired (not like in the diagram but really on the board) to the wrong side of the resistor? In that case pressing the button would directly short the 5V supply to ground, which matches the symptoms you describe.

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