Posted on May 17, 2011 at 15:05Hello,
I am using STM8L152C6 along with LSE 32768Hz crystal external oscillator.
For some reason (Crystal oscillator type? Recommended resistor/capacitor? Software procedure?) the signal is not seen by the microcontroller:
- I first activate LSE oscillator and poll during xx seconds the LSERDY bit
- I then initialize CLK_CRTCR after polling during xx seconds the RTCSWBSY bit
- but then RTC and LCD ITs occur rarely: approx. one every minute. It looks like the external crystal oscillator is not seen.
I have checked on the pin input/output of the LSE and the signal seems correct (0.5V amplitude with 0.6V offset). I have tried to change the serial resistor to a bigger value but result is the same. Do you have any suggestion that would help (HW/SW)?
Thanks.
