stopwatch's circuit??

[nobitank]

help me , i need a topwatch's circuit.
topwach's can display minute's , seconds and 1/100 seconds.

user led 7-segament , cyrstal and ...
stopwatch's can hold, reset

 

[mphotis]

try this link..i found it useful..

http://www.electronics-lab.com/projects/oscillators_timers/014/index.html