usb works without vusb connected?

Hey,

I have been experimenting with usb and the values of the various capacitors to see what it does to reliability. So far, it dosent seem to have much effect, in fact the app seems to run fine with pin 18 on my 4550(vusb) left hanging.


comments?

thanks. just trying to understand as much as possible!

Still using the same proto-board
http://www.picbasic.co.uk/forum/showthread.php?p=31405
So I'm sure that has a big affect on everything.

Here's the results I got.

Code:

---

        Error window        Recognized        RX Data
        ------------    ------------    ----------
No Cap        YES                Never                n/a
20pf        YES                Never                n/a
40pf        Intermittant        Occasionaly        NO Data
100pf        NO                YES                NO Data
220pf        NO                YES                Sometimes
440pf        NO                YES                Almost Always
.001uf        NO                YES                Always
.01uf        NO                YES                Always

---

In this case, anything below .001uf either doesn't work or is unreliable.
But I'm still sticking with .22uF

.

yeah.. in this case it worked with none, but ive got it going through a 1uf now, as that was convenient. I will take photos in a bit and paste em up..

right now it is still reading lots of stuff about usb and hid... sort of a bundle