P1021 QE UCC UART can be configured to synchronous mode.
The clock source options for the serial controllers for P1021 are shown in QEIWRM Rev.5 Table 5-6. "Clock Source Options—External Clock Signals (P1021, P1012, P1025, P1016)" or P1021RM Table 22-4. "Clock source options-external clock signals"
For example, you can configure UCC5 to use CLK13 as RXCLK and CLK15 as TXCLK. Further, these signals should be enabled via parallel port configuration. P1021RM Table 3-8: pin PB11 as CLK13, pin PB31 as CLK15.
Have a great day,
Pavel
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