Problem with stm32f103rb built in rtc

[adityadeysarkar]

RTC_CNTL and RTC_CNTH registers are not updationg with new values.
Below is my code.....
void SetRTC()
{
while (RTC_CRL.b5 == 0); // wait untill RTOFF is 1
RTC_CRL.B4 =1; //set cnf register

RTC_CNTL = 0xa498; // set time
RTC_CNTH = 0x1111; //set date

RTC_CRL.b4 = 0; // Configmode off

while (RTC_CRL.b5 == 0); // wait untill RTOFF is 1
}
program stops executing on the last line........
Any1 pls help me with this