Question
Resetting a timer with external pin
Posted on November 14, 2016 at 18:12
Folks,
I have been using an STM32 in a 100 pin package and using the PE0 pin which is the TIM4_ETR to reset timer 4 when the external line goes low. I'm thus able to have a timer interrupt go off when the external line doesn't go low after a certain period of time. Now, I'd like to use the 64-pin package, but this does not bring Timer 4's ETR pin to the outside world. It does, however, seem to me that I could use TIM4_CH1 or TIM4_CH2 to do the same job as the ETR pin by setting the TS bits in the SMCR register to be 101 or 110. So, the simple question is: do I understand correctly? Many thanks!