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The Real Time Clock (RTC) is an AMBA® slave module that connects to the Advanced Peripheral Bus (APB).
The following figure shows the RTC block diagram.
The RTC can be used to provide a basic alarm function or long time base counter. This is achieved by generating an interrupt signal after counting for a programmed number of cycles of a real-time clock input. Counting in one second intervals requires a 1Hz clock input to the RTC.