from 1 to 0. Explanation on how this is done is dealt in the later chapters. A backup reset can be generated when VDD or VBAT power on, if both supplies had been previously turned off. It can also be done in a software way when
RCC_BDCR bit is triggered. BDCR means backup domain control register. For this task there is also a function written namely, RCC_BackupResetCmd().
Now I would explain more about accessing the backup domain. After a reset these registers are protected against write access from possible unwanted write accesses. To enable access to the RTC domain and RTC registers we need to enable the power controller APB1 interface clock using the
RCC_APB1PeriphClockCmd() function. To enable access to RTC domain you can use the PWR_BackupAccessCmd()
RCC_BDCR bit is triggered. BDCR means backup domain control register. For this task there is also a function written namely, RCC_BackupResetCmd().
Now I would explain more about accessing the backup domain. After a reset these registers are protected against write access from possible unwanted write accesses. To enable access to the RTC domain and RTC registers we need to enable the power controller APB1 interface clock using the
RCC_APB1PeriphClockCmd() function. To enable access to RTC domain you can use the PWR_BackupAccessCmd()