Table 182. Counting Direction Versus Encoder Signals; Figure 225. Example Of Counter Operation In Encoder Interface Mode - ST STM32WL5 Series Reference Manual

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An external incremental encoder can be connected directly to the MCU without external

interface logic. However, comparators are normally be used to convert the encoder's

differential outputs to digital signals. This greatly increases noise immunity. The third

encoder output which indicate the mechanical zero position, may be connected to an

external interrupt input and trigger a counter reset.

direction control. It also shows how input jitter is compensated where both edges are

selected. This might occur if the sensor is positioned near to one of the switching points. For

this example we assume that the configuration is the following:

CC1S= 01 (TIMx_CCMR1 register, TI1FP1 mapped on TI1)

CC2S= 01 (TIMx_CCMR2 register, TI2FP2 mapped on TI2)

CC1P and CC1NP = '0' (TIMx_CCER register, TI1FP1 noninverted, TI1FP1=TI1)

CC2P and CC2NP = '0' (TIMx_CCER register, TI2FP2 noninverted, TI2FP2=TI2)

SMS= 011 (TIMx_SMCR register, both inputs are active on both rising and falling

CEN= 1 (TIMx_CR1 register, Counter is enabled)

configuration as above except CC1P=1).

Table 182. Counting direction versus encoder signals

Level on opposite

signal (TI1FP1 for

TI2, TI2FP2 for TI1)

gives an example of counter operation, showing count signal generation and

gives an example of counter behavior when TI1FP1 polarity is inverted (same

TI1FP1 signal

RM0453 Rev 1

General-purpose timer (TIM2)

TI2FP2 signal

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