Thank very much. Under your hint,I found the OSCin of rev V is a standard I/O pin on HSE bypass mode.But Almost TCXO's outputs have 0.8V Vpp and 0.9V VOH. Tthere is no TCXO being compatible with Rev V.To solve this problem,an extra circuit must be de...

Hi.Jzhua,I encountered the same question as you.I used a NDK 38.4MHz TCXO，set HSE bypass mode,HSE waiting timeout was resulted on Rev V,it didn't work.But on Rev Y,all is OK.Have you sovled this question? I supposed this is a bug on Rev V.If you s...