need document about RTC output on PC13 #800
Description
rtc.Calibrate(x)
x:
- -512.... 512: Normal calibration
- 0x8000 | 512: Enable RTC output 512Hz on PC13
- 0x8000 | 1: Enable RTC output 1 Hz on PC13
- 0x8000 | 0: Disable RTC output
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