20.4.2.1.5 Checksum

For LIN mode, two kinds of checksum are available: legacy and enhanced. In legacy checksum, only data bytes D0 through D7 are used to calculate the checksum. In enhanced checksum, data bytes D0 through D7 and PID[5:0], P0 and P1 are included. The type of checksum used in the calculation can be controlled by software using the C0EN bit. Refer to LIN/J2602 for more information on the checksum calculation.

For all other modes, when C0EN = 1, the UART calculates the checksum for every transmitted or received byte. Checksum register UxCHK is cleared on receiving a Break sequence in all protocol modes. These registers can also be cleared by the user.