In CAN communication, the minimum unit is called Time Quanta (TQ).
The TQ value changes depending on the reference clock (CAN_CLK) on CAN Device and prescaler (N-Prescaler) settings.
The API-CAN(WDM) driver references the bit rate value and sets the appropriate prescaler.
The reference clock (CAN_CLK) on our CAN communication PCI Express device
is equipped with 80MHz.
If the prescaler is 1, TQ will be 12.5nsec. (= 1 / 80MHz)
If the prescaler is 2, TQ will be 25.0nsec. (= 2 / 80MHz)
The reference clock (CAN_CLK) on our CAN communication USB device (or
Wi-Fi device) is equipped with 24MHz.
If the prescaler is 1, TQ will be 41.7nsec. (= 1 / 24MHz)
If the prescaler is 2, TQ will be 38.3nsec. (= 2 / 24MHz)