The current issue of Nuts & Volts (Dec 2001) shows a circuit
on page 54 connect to CTR(pins 4) and RTS(pin 7).

Anyone know how much current you can steal from the port?



Raymond Liu wrote:

> Hi,
>
> I am designing an in-circuit programmer using PIC16F876. I want it be able
> to run from PC serial port when doing code download. I need to get the mc
> powered from the port. I have read some articals about this before but can't
> recall where were them.I checked the pc serial port's DTR and RTS and found
> them all output -10V. Is it right that I need a software to toggle these
> pins to output positive and use them to power my circuit? How large current
> can they supply? Anyone has ideas? directions?
>
> Thank a lot in advance!
>
> Raymond
>
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