General-purpose timers (TIM2 to TIM5) RM0390
558/1328 RM0390 Rev 4
counters are aligned, Timer 1 must be configured in Master/Slave mode (slave with respect
to TI1, master with respect to Timer 2):
• Configure Timer 1 master mode to send its Enable as trigger output (MMS=001 in the
TIM1_CR2 register).
• Configure Timer 1 slave mode to get the input trigger from TI1 (TS=100 in the
TIM1_SMCR register).
• Configure Timer 1 in trigger mode (SMS=110 in the TIM1_SMCR register).
• Configure the Timer 1 in Master/Slave mode by writing MSM=1 (TIM1_SMCR register).
• Configure Timer 2 to get the input trigger from Timer 1 (TS=000 in the TIM2_SMCR
register).
• Configure Timer 2 in trigger mode (SMS=110 in the TIM2_SMCR register).
When a rising edge occurs on TI1 (Timer 1), both counters starts counting synchronously on
the internal clock and both TIF flags are set.
Note: In this example both timers are initialized before starting (by setting their respective UG
bits). Both counters starts from 0, but you can easily insert an offset between them by
writing any of the counter registers (TIMx_CNT). You can see that the master/slave mode
insert a delay between CNT_EN and CK_PSC on timer 1.
Figure 203. Triggering timer 1 and 2 with timer 1 TI1 input
17.3.16 Debug mode
When the microcontroller enters debug mode (Cortex
®
-M4 with FPU core - halted), the
TIMx counter either continues to work normally or stops, depending on DBG_TIMx_STOP
configuration bit in DBGMCU module. For more details, refer to Section 33.16.2: Debug
support for timers, watchdog, bxCAN and I2C.
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