STM32W108CB datasheet(185/278 Pages) STMICROELECTRONICS

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STM32W108HB STM32W108CC STM32W108CB STM32W108CZ

General-purpose timers

Doc ID 16252 Rev 14

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10.1.14

Timer synchronization

The two timers can be linked together internally for timer synchronization or chaining. A

timer configured in Master mode can reset, start, stop or clock the counter of the other timer

configured in Slave mode.

Figure 45 presents an overview of the trigger selection and the master mode selection

blocks.

Using one timer as prescaler for the other timer

For example, to configure Timer 1 to act as a prescaler for Timer 2 (see Figure 45):

●

Configure Timer 1 in Master mode so that it outputs a periodic trigger signal on each

update event. Writing MMS = 010 in the TIM1_CR2 register causes a rising edge to be

output on TRGO each time an update event is generated.

●

To connect the TRGO output of Timer 1 to Timer 2, configure Timer 2 in slave mode

using ITR0 as an internal trigger. Select this through the TS bits in the TIM2_SMCR

●

Put the slave mode controller in external clock mode 1 (write SMS = 111 in the

TIM2_SMCR register). This causes Timer 2 to be clocked by the rising edge of the

periodic Timer 1 trigger signal (which corresponds to the Timer 1 counter overflow).

●

Finally both timers must be enabled by setting their respective CEN bits (TIMx_CR1

Note:

If OCy is selected on Timer 1 as trigger output (MMS = 1xx), its rising edge is used to clock

the counter of Timer 2.

Figure 45.

Master/slave timer example

TRGO1

UEV

ITR1

Prescaler

Counter

SMS

MMS

TIMER 1

TIMER 2

Master

mode

control

Slave

mode

control

CK_PSC

Prescaler

Counter

Clock

Input

selection

trigger

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