MSP430FR2311: I2C Clock Speed too slow?

Hi there,

I'm using the MSP430FR2311 with the driverlib to communicate to a MPU9250 Sensor via I2C.
I configured the I2C using the examples from the driverlib:

#define CS_SMCLK_DESIRED_FREQUENCY_IN_KHZ   1000

//Set Ratio and Desired MCLK Frequency  and initialize DCO
CS_initFLLSettle(CS_SMCLK_DESIRED_FREQUENCY_IN_KHZ, CS_SMCLK_FLLREF_RATIO);
//Set SMCLK = DCO with frequency divider of 1
CS_initClockSignal(CS_SMCLK, CS_DCOCLKDIV_SELECT, CS_CLOCK_DIVIDER_1);
//Set MCLK = DCO with frequency divider of 1
CS_initClockSignal(CS_MCLK, CS_DCOCLKDIV_SELECT, CS_CLOCK_DIVIDER_1);
// Configure I2C pins 1.2 and 1.3
GPIO_setAsPeripheralModuleFunctionInputPin(GPIO_PORT_P1, GPIO_PIN2 + GPIO_PIN3, GPIO_PRIMARY_MODULE_FUNCTION);
// Disable the GPIO power-on default high-impedance mode to activate previously configured port settings
PMM_unlockLPM5();

//Initialize Master
EUSCI_B_I2C_disable(EUSCI_B0_BASE);
EUSCI_B_I2C_initMasterParam param = {0};
param.selectClockSource = EUSCI_B_I2C_CLOCKSOURCE_SMCLK;
param.i2cClk = CS_getSMCLK();
param.dataRate = EUSCI_B_I2C_SET_DATA_RATE_400KBPS;
//param.dataRate = EUSCI_B_I2C_SET_DATA_RATE_100KBPS;
param.byteCounterThreshold = 1;
param.autoSTOPGeneration = EUSCI_B_I2C_NO_AUTO_STOP;
EUSCI_B_I2C_initMaster(EUSCI_B0_BASE, &param);
//Specify slave address
EUSCI_B_I2C_setSlaveAddress(EUSCI_B0_BASE, MPU_I2C_ADDR);
//Enable I2C Module to start operations
EUSCI_B_I2C_enable(EUSCI_B0_BASE);

However, my logic analyzer shows the I2C Clock to only be ~196kHz when sending data to the sensor. The communication seems to work fine. I expected the clock to be around 400kHz, because of the 'EUSCI_B_I2C_SET_DATA_RATE_400KBPS'. Did I understand something wrong or am I doing something wrong?

Thanks and best regards,

moe