STM32W108HB datasheet(110/179 Pages) STMICROELECTRONICS

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General-purpose timers

STM32W108CB, STM32W108HB

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Doc ID 16252 Rev 2

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

TIM2_SMCR register).

●

Configure Timer 2 in trigger mode (TIM_SMS = 110 in the TIM2_SMCR register).

When a rising edge occurs on TI1 (Timer 1), both counters start counting synchronously on

the internal clock and both timers' INT_TIMTIF flags are set.

Note:

In this example both timers are initialized before starting by setting their respective TIM_UG

bits. Both counters starts from 0, but an offset can be inserted between them by writing any

of the counter registers (TIMx_CNT). The master/slave mode inserts a delay between

CNT_EN and CK_PSC on Timer 1.

Figure 45.

Triggering timer 1 and 2 with timer 1 TI1 input

8.1.15

Timer signal descriptions

Table 14.

Timer signal descriptions

Signal

Internal/external

Description

CK_INT

Internal

Internal clock source: connects to STM32W108 peripheral

clock (PCLK) in internal clock mode.

CK_PSC

Internal

Input to the clock prescaler.

ETR

Internal

External trigger input (used in external timer mode 2): a clock

selected by TIM_EXTRIGSEL in TIMx_OR.

ETRF

Internal

External trigger: ETRP after filtering.

ETRP

Internal

External trigger: ETR after polarity selection, edge detection

and prescaling.

ICy

External

Input capture or clock: TIy after filtering and edge detection.

ICyPS

Internal

Input capture signal after filtering, edge detection and

prescaling: input to the capture register.

ITR0

Internal

Internal trigger input: connected to the other timer's output,

TRGO.

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