Aerostar thanks for the reply....
my xtal is 32768 rectangular face (not cylindrical )... is not a Quartz?? i dont know...

i have read data sheet talking about the.. Bit 7 of Register 0 is the clock halt
(CH) bit...but i dont know how to clear it....(have in mind that my English is not good)

if U could show me how...i use the i2cwrite statement as U see for my programming..

yes i know about the battery.... i hane a 3V Li and when i disconnect it the lcd show 01/01/01 Sunday 01:01:01..

Thanks man!!