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RM0016 16-bit advanced control timer (TIM1)

Doc ID 14587 Rev 8 161/449

Using one timer to start another timer

Example 1

The enable of timer B is set with the UEV of timer A (refer to Figure 55 for connections).

Timer B starts counting from its current value (which can be non-zero) on the divided

internal clock as soon as the UEV is generated by timer A. When timer B receives the trigger

signal, its CEN bit is automatically set and the counter counts until 0 is written to the CEN bit

in the TIM1_CR1 register. Both counter clock frequencies are divided by four by the

prescaler compared to f

MASTER

CK_CNT

= f

MASTER

/4).

1. Configure timer A master mode to send its UEV as trigger output (MMS = 010 in the

TIM1_CR2 register).

2. Configure the timer A period (TIM1_ARR registers)

3. Configure timer B to get the input trigger from timer A (TS = 001 in the TIM1_SMCR

4. Configure timer B in trigger mode (SMS = 110 in TIM1_SMCR register)

5. Start timer A by writing 1 in the CEN bit (TIM1_CR1 register)

Figure 58. Triggering timer B with the UEV of timer A (TIMERA-UEV)

Timer B-TIF

Write TIF=0

FE FF

45 47 48

MASTER

Timer A-UEV

Timer A-CNT

Timer B-CNT

Timer B-CEN = CNT_EN

ST STM8S Reference Manual

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