Question: Wants to use a 40Mhz clock, but thinks he can only use up to a 20Mhz clock crystal. customer is looking to integrate this device with the LV21 1394 device and would like to use the e clock. How does he configure clock options...looking at data sheet, page 51.

Answer: In the 'C5x family, for example, if you have a 40MHz part you can run it up to 20MIPS. The 'C52 has an external/internal divide-by-two options, so for a 40MHz device, you can use the 40Mhz oscillator with a 20MIP 'C52.