STM32W108HB datasheet(187/278 Pages) STMICROELECTRONICS

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STM32W108HB STM32W108CC STM32W108CB STM32W108CZ

General-purpose timers

Doc ID 16252 Rev 14

187/278

The next example, synchronizes Timer 1 and Timer 2. Timer 1 is the master and starts from

0. Timer 2 is the slave and starts from 0xE7. The prescaler ratio is the same for both timers.

Timer 2 stops when Timer 1 is disabled by writing 0 to the CEN bit in the TIM1_CR1

●

Configure Timer 1 in master mode to send its Output Compare Reference (OC1REF)

signal as trigger output (MMS = 100 in the TIM1_CR2 register).

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Configure the Timer 1 OC1REF waveform (TIM1_CCMR1 register).

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Configure Timer 2 to get the input trigger from Timer 1 (TS = 000 in the TIM2_SMCR

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Configure Timer 2 in gated mode (SMS = 101 in the TIM2_SMCR register).

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Reset Timer 1 by writing 1 in the UG bit (TIM1_EGR register).

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Reset Timer 2 by writing 1 in the UG bit (TIM2_EGR register).

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Initialize Timer 2 to 0xE7 by writing 0xE7 in the Timer 2 counter (TIM2_CNTL).

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Enable Timer 2 by writing 1 in the CEN bit (TIM2_CR1 register).

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Start Timer 1 by writing 1 in the CEN bit (TIM1_CR1 register).

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Stop Timer 1 by writing 0 in the CEN bit (TIM1_CR1 register).

Figure 47.

Gating Timer 2 with enable of Timer 1

TIE

Clear TIE

CK_INT

TIM1_CR1 CEN=1

TIM2-CNT

TIM1_CNT

TIMER2-CNT_INIT

TIMER2

write CNT[15:0]

TIMER1-CNT_INIT

STM32W108HB Datasheet(PDF) 187 Page - STMicroelectronics