I'm not sure how the MFP pin works if I set the SQWE to '1' and the RS2 bit to '1'. Which output frequencies can I select with <RS1:RS0>? Is the frequency 64Hz regardless of what I do with R0 and R1? My aim is to calibrate the oscillator. I made myself a counter with a GPS modem as reference and a gating time of 60 seconds. Is it possible to output the 32.768Hz (RS<2:0> = 011) signal and count the pulses for 60s and then calculate the calibration factor? After writing the calibration factor in the calibration register I'll output a calibrated wave by setting RS2 to '1' and measure if the calibration is ok. Is this a good way to do the calibration? Or can you recommend me another way? My best device to measure time/frequency is the GPS-frequency counter. Thank you in advance for your help. http://ww1.microchip.com/downloads/en/DeviceDoc/25010E.pdf
I measured the frequency of the MPF output and it is 32767.166666Hz and this produces an error of about 2 second every day. Now I want to use the calibration function but I’m not sure if calculated the calibration factor right. I measured 1966030 pulses in one minute, but it should be 60*2^15=1966080. 1966080-1966030=50, so I have to add 50 pulse per minute. Does it means that I have to write 25 (0b00011001) in the calibration register?