SPRUJA3 November 2024 F29H850TU , F29H859TU-Q1
In F28P65x, the VSSOSC is used for connections for the crystal oscillator (X1 and X2) ground. If an external crystal is not used, the VSSOSC can be connected to the board ground, but is not required.
In F29H85x, the VSSOSC must be grounded, so that VSSOSC and VSS are on the same plane, for proper device operation.