[SOLVED] LPC2368 RTC clock source

Dear friends,
In my project i am trying to configure RTC. but had a doubt that as i am using clock source from the main crystal(in my case it is 12 Mhz).my question is if i turn off the device will my RTC work from this clock source.

Thanks in advance

where is the power to rtc coming when you turn off the device?????????

hi Bikashh,

it wil not work without battery power and need to use the standard crystal frequency(for RTC) i.e.,32.786KHZ -- can use 32KHz. With 12Mhz it wont work properly.

thanks for the reply
will try and let you know

i've written a progam for RTC but its not working please check.

main()
{
Init_UART0(9600);
InitTimer();
uart0Puts("Initialize OK \n\r");
RTC_Init();
while(1)
{}
}

__irq void RTC_ISR(void)
{
if(RTC_ILR & 0x01)
{
uart0Puts("Counter incrementing\n\r");
RTC_ILR = 0x01; //clear interrupt
}

VICVectAddr=0x00000000;//dummy write to signal end of enterrupt
}

void RTC_Init(void) //Pclk=12Mhz
{
RTC_CISS = 0x00;
RTC_CIIR = 0x01; //enable seconds counter interrupt
RTC_CCR = 0x01; // Enable clock
RTC_ILR = 0x01; //enable clock interrupt and inactive alarm interrupt
RTC_PREINT = 0x0000016D; //set RTC prescalar for 12Mhz;=(PCLK/3276-1
RTC_PREFRAC= 0x00001B00; // = PCLK - ((PREINT + 1) x 3276

VICVectAddr13=(unsigned long)RTC_ISR;
VICVectCntl13=0x0000002D;
VICIntEnable= 0x00002000;
}

thanks for the reply

anybody please reply

hi, my RTC is working in pooling mode but unable to run using IRQ.
thanks for the reply

yes,my RTC is running properly and i am also able to assert the service routine.
but now my RTC gets reset when i restart the device.RTC is given seperate battery backup and 32khz crystal. how can i keep my data unchanged


thanks