Figure 127. Example Of Counter Operation In Encoder Interface Mode; Figure 128. Example Of Encoder Interface Mode With Ti1Fp1 Polarity Inverted - ST STM32F405 Reference Manual

Advanced-control timers (TIM1 and TIM8)
Counter
Figure 128
configuration as above except CC1P='1').

Figure 128. Example of encoder interface mode with TI1FP1 polarity inverted.

Counter
The timer, when configured in Encoder Interface mode provides information on the sensor's
current position.The user can obtain dynamic information (speed, acceleration,
deceleration) by measuring the period between two encoder events using a second timer
configured in capture mode. The output of the encoder which 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. This can be done by latching the counter value into a third
input capture register if available (then the capture signal must be periodic and can be
generated by another timer). when available, it is also possible to read its value through a
DMA request generated by a real-time clock.
554/1749

Figure 127. Example of counter operation in encoder interface mode.

forward
TI1
TI2
up
gives an example of counter behavior when TI1FP1 polarity is inverted (same
forward
TI1
TI2
down
jitter backward
down
jitter backward
up
RM0090 Rev 18
jitter forward
up
jitter forward
down
RM0090
MS33107V1
MS33108V1