STM32W108HB datasheet(102/179 Pages) STMICROELECTRONICS

102 / 179 page

General-purpose timers

STM32W108CB, STM32W108HB

102/179

Doc ID 16252 Rev 2

Figure 34.

Example of counter operation in encoder interface mode

Figure 35 gives an example of counter behavior when IC1FP1 polarity is inverted (same

configuration as above except TIM_CC1P = 1).

Figure 35.

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).

8.1.12

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.

The XOR output can be used with all the timer input functions such as trigger or input

capture. It is especially useful to interface to Hall effect sensors.

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