While receiving a frame, the baud rate used by the sender may not be exactly the one expected. In this case, the hardware drift compensation algorithm recovers up to 16% clock drift (expected baud rate ±16% will be supported).
Drift compensation is available only in 16X Oversampling mode. To enable the hardware system, US_MAN.DRIFT must be set. If the RXD edge is between one and three 16X clock cycles far from the expected edge, then the period is shortened or lengthened accordingly, to center the RXD edge.
The drift compensation hardware feature allows up to 16% clock drift to be handled, provided the system clock is fast enough compared to the selected baud rate.
Figure 1. Bit Resynchronization
