RM0312 datasheet(132/275 Pages) STMICROELECTRONICS

132 / 275 page

16-bit general purpose timer (TIM2/TIM3)

RM0312

132/275

DocID022352 Rev 3

For example, you can measure the period (in the TIMx_CCR1 register) and the duty cycle

(in the TIMx_CCR2 register) of the PWM applied on TI1 using the following procedure

(depending on fMASTER frequency and prescaler value):

Select the active input capture or trigger input for TIMx_CCR1: write the CC1S bits to

0b01 in the TIMx_CCMR1 register (TI1FP1 selected).

Select the active polarity for TI1FP1 (used both for capture in TIMx_CCR1 and counter

clear): write the CC1P bit to ‘0’ (active on rising edge).

Select the active input for TIMx_CCR2: write the CC2S bits to 0b10 in the

TIMx_CCMR2 register (TI1FP2 selected).

Select the active polarity for TI1FP2 (used for capture in TIMx_CCR2): write the CC2P

bit to ‘1’ (active on falling edge).

Select the valid trigger input: write the TS bits to 0b101 in the TIMx_SMCR register

(TI1FP1 selected).

Configure the clock/trigger controller in reset mode: write the SMS bits to ‘100’ in the

TIMx_SMCR register.

Enable the captures: write the CC1E and CC2E bits to ‘1’ in the TIMx_CCER1 register.

Figure 53. PWM input signal measurement example

17.5.4

Output stage

The output stage generates an intermediate waveform called OCiREF (active high) which is

then used for reference. Break functions and polarity act at the end of the chain.

Figure 54. Channel output stage block diagram

TI1

TIMx_CNT

0000

0001

0002

0003

0004

0000

0004

TIMx_CCR1

TIMx_CCR2

0004

0002

IC1 Capture

period measurement

reset counter

IC2 Capture

pulse width measurement

OC1REF

OC2REF

output

control

output

control

TIMx_CH1

OC1

from capture/compare

channels

TIMx_CH2

OC2

RM0312 Datasheet(PDF) 132 Page - STMicroelectronics

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