Some low-frequency 32.768kHz crystal oscillators of MSP430F169 do not oscillate. What's the situation?

huyuezhan

Some low-frequency 32.768kHz crystal oscillators of MSP430F169 do not oscillate. What's the situation? [Copy link]

Except for the part of the program using the aclk timer, the other work is normal. The oscilloscope shows that there is a high level but no 32k signal. The passive crystal oscillator (12.5pF) is directly connected, and no external load capacitor is added.

蓝雨夜

Does 169 require external load capacitors?

huyuezhan

Blue Rain Night published on 2021-8-31 10:17 Does 169 need external load capacitors?

It worked fine without configuration before, so I don't think it's necessary.

damiaa

Try changing the crystal. When I was working on the 32.768 clock crystal oscillator of ST, I found that the crystal is very important. You need to look at the requirements of the chip for the crystal, and then choose the crystal and match the capacitor according to the requirements.

lkh747566933

https://en.eeworld.com/bbs/thread-1256387-1-1.html "What is the reason why the crystal oscillator does not oscillate? You need to know these solutions! "