General-purpose timer (TIM2) RM0453
822/1450 RM0453 Rev 5
26 General-purpose timer (TIM2)
26.1 TIM2 introduction
The general-purpose timer TIM2 consists of a 32-bit auto-reload counter driven by a
programmable prescaler.
The timer 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 and the RCC clock controller prescalers.
26.2 TIM2 main features
• 32-bit up, down, up/down auto-reload counter.
• 16-bit programmable prescaler used to divide (also “on the fly”) the counter clock
frequency by any factor between 1 and 65535.
• Up to 4 independent channels for:
– Input capture
– Output compare
– PWM generation (Edge- and Center-aligned modes)
– One-pulse mode output
• Synchronization circuit to control the timer with external signals and to interconnect
several timers.
• Interrupt/DMA generation on the following events:
– Update: counter overflow/underflow, counter initialization (by software or
internal/external trigger)
– Trigger event (counter start, stop, initialization or count by internal/external trigger)
– Input capture
– Output compare
• Supports incremental (quadrature) encoder and hall-sensor circuitry for positioning
purposes
• Trigger input for external clock or cycle-by-cycle current management
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