problem of USART's CTS RTS

superwht · ‎2009-08-30

Posted on August 31, 2009 at 01:19

superwht · ‎2011-05-17

Posted on May 17, 2011 at 13:21

hello,

I meet this problem when using gpio pin PA11 and PA12, this two pins are shared as USART1's CTS and RTS.when sending data on USART1,pulses could be detected on this two pins.However, I didn't enable CTS and RTS.And I have checked the regesiters of USART1 when simulating, they are not enabled indeed.

has anyone know the reason? or it is a silicon bug?

16-32micros · ‎2011-05-17

Posted on May 17, 2011 at 13:21

Hi superwht,

Could you detail how did you configured your Pins, PA9, PA10, PA11 and PA12 ?

may be you have a wrong configuration in software, or may be also your hardware layout is not clean and external cross-talk is created between pins.

Cheers,

STOne-32.

superwht · ‎2011-05-17

Posted on May 17, 2011 at 13:21

STone-32,

thanks for your advices, I have checked the external circuit and found the problem actually come from the circuit.