PWM Input capture reset behaviour
Hello,
I have a question regarding several timers which are confiugred in PWM input mode (CCR1 is used to measure the PWM period and CCR2 is used to measure the PWM Width). So far when I plug a user signal on the evalution board, I can see the correct values captured in both registers. When I switch off the user signal, I see that the CCR1/2 registers are holding the last captured value, even if nothing is connected to this pin. I was expecting to read a 0 once I disconnect the user signal in order to perform a reset of the registers.
Is there a way to take advantage of the internal status registers (SR) or Event generation registers ( e.g. CC1IF) in order to poll flags to check if new updates have occured? I would like to avoid to use additional compare registers e.g. CCR3 or CCR4 and create unnecessary interrupt overhead. Moreover, this pattern is only applicable on advanced timer, not on basic timers which only have two compare registers CCR1 and CCR2.
I was thinking in case internal registers can be used for this purpose to use an internal timestamp and to check that everytime.
Is there a method available ?
