I would read it that you cannot use an external crystal oscillator as the primary oscillator. In any event I would get out a breadboard and try the internal oscillator with a crystal. Allen > -----Original Message----- > From: piclist-bounces@mit.edu [mailto:piclist- > bounces@mit.edu] On Behalf Of Electron > Sent: Sunday, August 20, 2017 5:33 AM > To: Microcontroller discussion list - Public. > Subject: [PIC] Errata of PIC32MZ EF FAMILY >=20 >=20 > Hi! > on the errata of the PIC32MZ EF FAMILY for the A1 revision I > can read: >=20 > 2. Module: Oscillator > Revision A1 Silicon: > A crystal oscillator cannot be used as an input to the Primary > Oscillator > (POSC) pins OSC1 and OSC2. > Revision A1 Silicon Work around: > Use an external clock or the Internal FRC Oscillator. >=20 > Is it right to understand that in A1 revisions a Xtal cannot be > used? >=20 > This is a serious and unexpected bug, no doubt. I have plenty > of A1's.. :-( >=20 > Cheers (not really), > Mario >=20 > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list > archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .