The frame counters are used as time base for the different functions (e.g. blinking or automated modes). There are three independent frame counters FC0, FC1, and FC2, which can be associated with any function.
The frame counter is synchronized to the LCD frame start and generates an internal event each time the counter overflows. The maximum value can be set for the (FCx.OVF) is 0x1F.
The formula used to generate the frequency of the interval event is fFCx = ( FrameRate) / ( (FCx.OVF x 8) +1).
The FCx register can only be written when the frame counter x is disabled.