In the oversampling mode, the Prescaler is set to UCBRx = INT(N/16), and the first stage modulator is set to UCBRFx = round([(N/16) – INT(N/16)] × 16)
When greater accuracy is required, the UCBRSx modulator can also be implemented with values from 0 to 7. To find the setting that gives the lowest maximum bit error rate for any given bit, a detailed error calculation must be performed for all settings of UCBRSx from 0 to 7 with the initial UCBRFx setting, and with the UCBRFx setting incremented and decremented by one.