DVP3 Emulator: problem with shared supply tension!Help

[ciccio2]

Posted on October 08, 2004 at 06:46

DVP3 Emulator: problem with shared supply tension!Help

[ciccio2]

Posted on October 06, 2004 at 12:53

I must to simulation ST7LITE19M with ST7-DVP3.

In PA7 and PB6 there are 2 buttons,open and close, that pull-up the voltage at 5V. In interrupt will be capture they.

Problem:when i push open (pull-up 5V) the button close pull-up a 1,6-2 volts????

Result:both buttons are pushed!!Don't run!

Is it a problem of shared power supply tension?

Solution?

Thanks a lot!

[alok2]

Posted on October 07, 2004 at 12:18

Can you pls re-frame yr question ? I havnt used the DVP but..

When you say

''

when i push open (pull-up 5V) the button close pull-up a 1,6-2 volts???? Result:both buttons are pushed!!''

What exactly you mean ? isnt it a mechanical problem.

[ciccio2]

Posted on October 08, 2004 at 06:46

No mechanic problem but electric problem.

2 input floating. When i connect 1 input at 5v other input pull-up at 1 volt.

I have resolving: Emulator dont like over tension on other pin.

In other input pin i have 5,6v (Vdd=5). I have diminished the tension on other pin (5,6 -> 4,5) and the emulator is OK.