RM0312 datasheet(105/275 Pages) STMICROELECTRONICS

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RM0312

16-bit general purpose timer (TIM2/TIM3)

170

16-bit general purpose timer (TIM2/TIM3)

17.1

Introduction

This chapter describes TIM2 and TIM3 which are identical timers and referred to as TIMx.

Each general purpose timer (TIMx) has a 16-bit up-down auto-reload counter driven by a

programmable prescaler.

In this section, the index i, may be 1 or 2 referring to the two capture/compare channels.

The timers may be used for a variety of purposes, including:

•

Time base generation

•

Measuring the pulse lengths of input signals (input capture)

•

Generating output waveforms (output compare, PWM and One Pulse Mode)

•

Interrupt capability on various events (capture, compare, overflow, break, trigger)

•

Synchronization with other timers or external signals (external clock, reset, trigger and

enable)

These timers are ideally suited for a wide range of control applications, including those

requiring center-aligned PWM capability.

The timer clock can be sourced from internal clocks or from an external source selectable

through a configuration register.

17.2

TIMx main features

TIMx features include:

•

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

•

3-bit programmable prescaler allowing the counter clock frequency to be divided “on

the fly” by any power of 2 between 1 and 128.

•

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

several timers.

•

2 independent channels that can alternately be configured as:

–

Input capture

–

Output compare

–

PWM generation (edge and center-aligned mode)

–

One Pulse Mode output

•

Break input to put the timer output signals in reset state or in a known state.

•

Interrupt 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

–

Break input

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