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Original question:

AM2632: Changing Clock frequency for MCAN

AM2632: Change the clk source of MCAN

Hang Yang
Intellectual 2801 points
Part Number: AM2632

Tool/software:

Hi Experts,

In syscfg we can change the bit rates of CANFD, however the settings are based on the 80MHz clock input. Is it possible to change the clock of MCAN module to 40Mhz?

  • 0
    TI__Mastermind 23043 points

    Hello Hang,

    Yes, this is possible. The MSS_RCM CTRLMMR registers contain MSS_MCANx_CLK_DIV_VAL registers.

    The current clocktree for MCAN0 is as follows:

    CLK_SRC: DPLL_CORE_HSDIV0_CLKOUT0 (Default Clock Source after Reset) (400MHz)

    CLK_DIV: 4 (Div by 5)

    MCAN0_CLK = 80MHz

    If you change the MSS_MCAN0_CLK_DIV_VAL to 9 (Div by 10)

    then your resulting MCAN0_CLK = 40MHz

    Best Regards,

    Zackary Fleenor