STM32W108C8

STM32W108C8
General-purpose timers
Figure 37.
Example of counter operation in encoder interface mode
Figure 38 gives an example of counter behavior when IC1FP1 polarity is inverted (same
configuration as above except TIM_CC1P = 1).
Figure 38.
Example of encoder interface mode with IC1FP1 polarity inverted
The timer configured in encoder interface mode provides information on a sensor's current
position. To obtain dynamic information (speed, acceleration/deceleration), measure the
period between two encoder events using a second timer configured in capture mode. The
output of the encoder that indicates the mechanical zero can be used for this purpose.
Depending on the time between two events, the counter can also be read at regular times.
Do this by latching the counter value into a third input capture register. (In this case the
capture signal must be periodic and can be generated by another timer).
10.1.12 Timer input XOR function
The TIM_TI1S bit in the TIM1_CR2 register allows the input filter of channel 1 to be
connected to the output of a XOR gate that combines the three input pins TIMxC2 to
TIMxC4.
Doc ID 018587 Rev 2 132/215