TS-TPC-7990 RTC

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This board uses a M41T00S STMicro Battery Backed RTC using an external and replaceable coin cell battery. This RTC is connected to the CPU via I2C and is handled by the kernel and is presented as a standard RTC device in linux.

With the provided battery this is expected to last 6 years. The RTCs are tested by the manufacturer to +-35ppm at 25C, which is about 1.53 minutes per month.

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