STM32W108HB datasheet(155/278 Pages) STMICROELECTRONICS

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STM32W108HB STM32W108CC STM32W108CB STM32W108CZ

General-purpose timers

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General-purpose timers

Each of the STM32W108's two general-purpose timers consists of a 16-bit auto-reload

counter driven by a programmable prescaler. They may be used for a variety of purposes,

including measuring the pulse lengths of input signals (input capture) or generating output

waveforms (output compare and PWM). Pulse lengths and waveform periods can be

modulated from a few microseconds to several milliseconds using the timer prescaler. The

timers are completely independent, and do not share any resources. They can be

synchronized together as described in Section 10.1.14: Timer synchronization on page 185.

The two general-purpose timers, TIM1 and TIM2, have the following features:

●

16-bit up, down, or up/down auto-reload counter.

●

Programmable prescaler to divide the counter clock by any power of two from 1 through

32768.

●

4 independent channels for:

–

Input capture

–

Output compare

●

PWM generation (edge- and center-aligned mode)

●

One-pulse mode output

●

Synchronization circuit to control the timer with external signals and to interconnect the

timers.

●

Flexible clock source selection:

–

Peripheral clock (PCLK at 6 or 12 MHz)

–

32 kHz HSE OSC (if available)

–

1 kHz clock

●

GPIO input

●

Interrupt generation on the following events:

–

Update: counter overflow/underflow, counter initialization (software or

internal/external trigger)

–

Trigger event (counter start, stop, initialization or count by internal/external trigger)

●

Input capture

●

Output compare

●

Supports incremental (quadrature) encoders and Hall sensors for positioning

applications.

●

Trigger input for external clock or cycle-by-cycle current management.

Note:

Because the two timers are identical, the notation TIMx refers to either TIM1 or TIM2. For

example, TIMx_PSC refers to both TIM1_PSC and TIM2_PSC. Similarly, "y" refers to any of

the four channels of a given timer, so for example, OCy refers to OC1, OC2, OC3, and OC4.

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