STM32W108C8

General-purpose timers
STM32W108C8
10 General-purpose timers
Each of the STM32W108C8'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 136.
Note:
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 external clock (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.
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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