In the datasheet it is given at 40MHz the max C_L is 8pF (from AN6027), but the C_L in the design schema has C1 and C2 8pF(UM3305), which gives 4pF, could you suggest me with the external crystal oscillator design. And the range is from 4MHz to 40MHz, so if for a chosen crystal , should the minimum frequency satisfy this condition ?
