Hi Albert, You are overclocking the oscillator circuit. The original definition for DEVICE_SETCLOCK_CFG in the examples is meant for the 10MHz internal oscillator. If you apply the clock input multiplier of 48 to 10MHz, this will produce a 480MHz VCO clock for the PLL, which meets the spec value. When you switched to XTAL which has a clock frequency of 20MHz, VCO is now at 960MHz, which is way out of spec. Change the multiplier to 24 to get the VCO clock in the spec. Regards, Joseph
↧