General-purpose timers (TIM15/16/17) RM0351
930/1693 DocID024597 Rev 3
28 General-purpose timers (TIM15/16/17)
28.1 TIM15/16/17 introduction
The TIM15/16/17 timers consist 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, PWM,
complementary PWM with dead-time insertion).
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.
The TIM15/16/17 timers are completely independent, and do not share any resources. They
can be synchronized together as described in Section 27.3.19: Timer synchronization on
page 896.
28.2 TIM15 main features
TIM15 includes the following features:
• 16-bit auto-reload upcounter
• 16-bit programmable prescaler used to divide (also “on the fly”) the counter clock
frequency by any factor between 1 and 65535
• Up to 2 independent channels for:
– Input capture
– Output compare
– PWM generation (edge mode)
– One-pulse mode output
• Complementary outputs with programmable dead-time (for channel 1 only)
• Synchronization circuit to control the timer with external signals and to interconnect
several timers together
• Repetition counter to update the timer registers only after a given number of cycles of
the counter
• Break input to put the timer’s output signals in the reset state or a known state
• Interrupt/DMA generation on the following events:
– Update: counter overflow, counter initialization (by software or internal/external
trigger)
– Trigger event (counter start, stop, initialization or count by internal/external trigger)
– Input capture
– Output compare
– Break input (interrupt request)
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