Table 253. Counting Direction Versus Encoder Signals (Cc1P = Cc2P = 0) - ST STM32G4 Series Reference Manual

Advanced arm-based 32-bit mcus

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Table 253. Counting direction versus encoder signals (CC1P = CC2P = 0)

tim_ti1 only

tim_ti2 only

tim_ti1 only

tim_ti2 only

A quadrature 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 the external trigger input and

trigger a counter reset.

and 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, tim_ti1fp1 mapped on tim_ti1).

CC2S='01' (TIMx_CCMR2 register, tim_ti1fp2 mapped on tim_ti2).

CC1P='0' and CC1NP='0' (TIMx_CCER register, tim_ti1fp1 non-inverted,

tim_ti1fp1=tim_ti1).

CC2P='0' and CC2NP='0' (TIMx_CCER register, tim_ti1fp2 non-inverted, tim_ti1fp2=

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

CEN='1' (TIMx_CR1 register, Counter enabled).

(tim_ti1fp1 for

tim_ti2fp2 for

gives an example of counter operation, showing count signal generation

RM0440 Rev 1

Advanced-control timers (TIM1/TIM8/TIM20)

tim_ti1fp1 signal

tim_ti2fp2 signal

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