18f2525, timer1 realtime clock with external 32768hz crystal

[lubom]

Hello,
I have read a lot of threads about rtc but didn't found how to solve my problem.
I need to use timer1 on 18f2525(operating at 8MhzINTOSC) with external crystal at 32768hz to provide realtime time&data for datalogging purpose.
I need to provide time&date printout via rs232 when interrupt occurs( interrupt will be onchange portb.7 event)
Thanks in advance.
Best regards,
Lubo
P.S.
i want to use timer1 because as written in datasheet it will operate when pic is in sleep mode.
How can i preload the timer1 counter it update itself every 0.5 or 0.1 seconds

[PCM programmer]

[lubom]

I checked the code in http://www.ccsinfo.com/forum/viewtopic.php?t=26177
Can you please tell me how to modify the following lines of the program to work with external crystal 32kHz connected at T1OSO and T1OSI and what kind of #fuse is needed for it to operate:

#define XTAL_FREQUENCY 20000000
#define TIMER1_FREQUENCY (XTAL_FREQUENCY / 4) // 1 clock tick = 1 instr. cycle =
void Initialize_RTC(void)
{
Ticker = TIMER1_FREQUENCY; // initialize clock counter to number of clocks per second
setup_timer_1( T1_INTERNAL | T1_DIV_BY_1 ); // initialize 16-bit Timer1 to interrupt
// exactly every 65536 clock cycles
// (about 76 times per second)
enable_interrupts( INT_TIMER1 ); // Start RTC
}

Thanks.
Regards,
Lubo