1.1. About the Real Time Clock

The Real Time Clock (RTC) is an Advanced Microcontroller Bus Architecture (AMBA) compliant System-on-a-Chip (SoC) peripheral that is developed, tested, and licensed by ARM.

The RTC is an AMBA 2 slave module that connects to the Advanced Peripheral Bus (APB).

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 is achieved by use of a 1Hz clock input to the RTC. Figure 1.1 shows the connections to the RTC.

Figure 1.1. RTC connection diagram

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