STM32W108CBU6 STMICROELECTRONICS [STMicroelectronics], STM32W108CBU6 Datasheet - Page 108

• Manufacturer Part Number: STM32W108CBU6
• Description: High-performance, IEEE 802.15.4 wireless system-on-chip
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

General-purpose timers
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Figure 42. Gating timer 2 with enable of timer 1
Using one timer to start the other timer
In this example, the enable of Timer 2 is set with the update event of Timer 1. Refer to
Figure 40
zero) on the divided internal clock as soon as Timer 1 generates the update event.
When Timer 2 receives the trigger signal its TIM_CEN bit is automatically set and the
counter counts until 0 is written to the TIM_CEN bit in the TIM2_CR1 register. Both counter
clock frequencies are divided by 3 by the prescaler compared to CK_INT (fCK_CNT =
fCK_INT/3).
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Initialize Timer 2 to 0xE7 by writing 0xE7 in the Timer 2 counter (TIM2_CNTL).
Enable Timer 2 by writing 1 in the TIM_CEN bit (TIM2_CR1 register).
Start Timer 1 by writing 1 in the TIM_CEN bit (TIM1_CR1 register).
Stop Timer 1 by writing 0 in the TIM_CEN bit (TIM1_CR1 register).
Configure Timer 1 in master mode to send its update event as trigger output
(TIM_MMS = 010 in the TIM1_CR2 register).
Configure the Timer 1 period (TIM1_ARR register).
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).
Start Timer 1: Write 1 in the TIM_CEN bit (TIM1_CR1 register).
for connections. Timer 2 starts counting from its current value (which can be non-
Doc ID 16252 Rev 2
STM32W108CB, STM32W108HB