STM32W108HB datasheet(183/278 Pages) STMICROELECTRONICS

Part #	STM32W108HB

Description	High-performance, IEEE 802.15.4 wireless system-on-chip with up to 256 Kbytes of embedded Flash memory

PDF	278 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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183 / 278 page

STM32W108HB STM32W108CC STM32W108CB STM32W108CZ

General-purpose timers

Doc ID 16252 Rev 14

183/278

Slave mode: Trigger mode

In Trigger mode the counter starts in response to an event on a selected input.

In the following example, the up-counter starts in response to a rising edge on the TI2 input:

●

Configure channel 2 to detect rising edges on TI2 Configure the input filter duration. In

this example, no filter is required so IC2F = 0000. The capture prescaler is not used for

triggering, so it is not configured. The CC2S bits select the input capture source only,

CC2S = 01 in the TIMx_CCMR1 register. Write CC2P = 0 in the TIMx_CCER register to

validate the polarity and detect high level only.

●

Configure the timer in Trigger mode by writing SMS = 110 in the TIMx_SMCR register.

Select TI2 as the input source by writing TS = 110 in the TIMx_SMCR register.

When a rising edge occurs on TI2, the counter starts counting on the internal clock and the

TIE flag is set.

The delay between the rising edge on TI2 and the actual start of the counter is due to the

resynchronization circuit on the TI2 input.

Figure 43.

Control circuit in Trigger mode

Counter clock = CK_CNT = CK_PSC

Counter register

35 36 37 38

TI2

CNT_EN

TIE

STM32W108HB Datasheet(PDF) 183 Page - STMicroelectronics