Timer Input Xor Function; Figure 93. Example Of Counter Operation In Encoder Interface Mode; Figure 94. Example Of Encoder Interface Mode With Ti1Fp1 Polarity Inverted - ST STM32F101 series Reference Manual

RM0008 Advanced-control timers (TIM1&TIM8)

Figure 93. Example of counter operation in encoder interface mode.

forward jitter backward jitter forward
TI1
TI2
Counter
down up
up
Figure 94 gives an example of counter behavior when TI1FP1 polarity is inverted (same
configuration as above except CC1P='1').

Figure 94. Example of encoder interface mode with TI1FP1 polarity inverted.

forward jitter backward jitter forward
TI1
TI2
Counter
down up down
The timer, when configured in Encoder Interface mode provides information on the sensor's
current position. You 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. You can do this 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.
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