Shahzad Aslam wrote:
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Raghunathan i have some device which outputs +5V in normal conditions and 0V or FLOAT in alarm conditions. So regardless i want my microcontroller read 0V or FLOAT as 0.

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Well, I understand you are using sensors with ONE NC contact only. IN this case, if you have 16 free pins on you controller (excluding port 0), then use PULL-DOWN resistors on those pins and connect the output ofthe sensors to thepins. Now, when the sensors are in normal conditions, you get a healthy +5v signals and will be detected as 1 by the µC. When in alarm condition, the contact opens (thus leaving the pin in external Float), the Pull-Down ensures your controller reads it as 0.

GUESS your problems are solved and peace restored... :) :)

Can I have some coke please (as I dont Drink beer :)) ).

-Harsha