TM4C123FH6PM: Unable to use CAN with 80 or 66.7 MHz clock

Hello!

Clock initialization:

/*
    SysCtlClockSet(SYSCTL_SYSDIV_2 | SYSCTL_USE_PLL | SYSCTL_OSC_MAIN |
                   SYSCTL_XTAL_16MHZ);
    uint32_t Clk = SysCtlClockGet();    // Clk = 80000000

    SysCtlClockSet(SYSCTL_SYSDIV_3 | SYSCTL_USE_PLL | SYSCTL_OSC_MAIN |
                   SYSCTL_XTAL_16MHZ);
    uint32_t Clk = SysCtlClockGet();    // Clk = 66666666
*/
    SysCtlClockSet(SYSCTL_SYSDIV_4 | SYSCTL_USE_PLL | SYSCTL_OSC_MAIN |
                   SYSCTL_XTAL_16MHZ);
    uint32_t Clk = SysCtlClockGet();    // Clk = 50000000

CAN initialization:

CANInit(CANBase);
uint32_t Clk = SysCtlClockGet();

// This works only at 50MHz system clock
// At 80MHz this setting causes the CAN frame is 20% longer in time, seen by scope.
// At 66.7 MHz system clock the errors almost completely blocking communication, the frame length is unstable
//CANBitRateSet(CANBase, Clk, 250000); 

// This works at 80MHz, but causes errors at bus as bit timing has 0.5% error.
// I can communicate with other devices, but when I connect CAN bus monitor to the bus (I have PEAKCAN and VS-COM),
// it starts generating error frames.
//CANBitRateSet(CANBase, 66666666, 250000);

// This is the best setting for 50MHz system clock
tCANBitClkParms Params = {7, 2, 0, 20};
CANBitTimingSet(CANBase, &Params);