The cpu runs correctly with 16MHz internal RC , we want to use the internal PLL with connecting an External oscillator 8MHZ
=> the cpu doesnt start correctly because it detects
S_FXOSC =0 (0 fast external crystal oscillator (4-16 MHz) is not stable)
the oscillator is MASTERCRISTAL MCS01Y-B-8MHZ level is 1,2V , square wave is clean , stable and accurate 8MHZ
The trace of XTAL is short (3.5mm) , the EXTAL is left unconnected (we try too with EXTAL grounded )
With 2 différents boards , the problem is the same
Can any body help us ?
Thanks for all