EM357-RTR datasheet(121/240 Pages) ETC2

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EM351 / EM357

9 General Purpose Timers (TIM1 and TIM2)

9.1 Introduction

Each of the EM35x’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 the Timer Synchronization section.

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)

• 32.768 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.

Figure 9-1 shows an overview of a timer’s internal structure.

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.

9-1

120-035X-000D

Preliminary

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