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[AVR] Count down timer using avr

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arecssor

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hi i want to design a count down display using avr ,the counter should produce a interrupt signal or indication when the count reached at zero , the count length has to be variable , so that it can be changed as per requirement . am using code vision avr compiler , can anyone help me in this project ? .

Thanks in advance
 

milan.rajik

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You mean a countdown timer using 7 Segment displays ? If yes, what is the problem in implementing it ?
 

arecssor

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i want the source code design , the counter should have the following
1. the count should start from the number specified by the 3 bit input to the micro controller
2. the count starts only when the enable pin is high
i want to design it in codevision avr compiler , when i am trying to do this tutorials for codevision avr is not available for this
one ,if you can help me to design the program that will be great

Thank you
 

milan.rajik

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3 bit = 2^3 = 8 values. Do you mean 3 digit ? like 0 to 999 ? You didn't answer whether you are using 7 Segment display or LCD. If 7 Segment display (SSD) then is it Common Cathode (CC) or Common Anode (CA) ? I will write code if you answer my questions.
 

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