RM0440 Rev 4 1359/2126
RM0440 General-purpose timers (TIM15/TIM16/TIM17)
1445
only by software (except UG which remains cleared automatically). As soon as the CEN bit
is written to 1, the prescaler is clocked by the internal clock tim_ker_ck.
Figure 450 shows the behavior of the control circuit and the upcounter in normal mode,
without prescaler.
Figure 450. Control circuit in normal mode, internal clock divided by 1
External clock source mode 1
This mode is selected when SMS=111 in the TIMx_SMCR register. The counter can count at
each rising or falling edge on a selected input.
Figure 451. tim_ti2 external clock connection example
For example, to configure the upcounter to count in response to a rising edge on the tim_ti2
input, use the following procedure:
MSv62317V1
tim_ker_ck
tim_cnt_ck, tim_psc_ck
Counter register
CEN
UG
CNT_INIT
00
02
03
04 05
06 0732
33
34 35 36
31
01
MSv62365V1
External clock
mode 1
Internal clock
mode
tim_psc_ck
TIMx_SMCR
SMS[2:0]
tim_itrx
tim_ti1_ed
tim_ti1fp1
tim_ti2_fp2
TIMx_SMCR
TS[4:0]
tim_ti2_in0
0
1
TIMx_CCER
CC2P
TIMx_CCMR1
Edge
detector
tim_ti2f_rising
00110
000xx
00100
00101
Filter
ICF[3:0]
(internal clock)
tim_ti2
tim_trgi
tim_ker_ck
TIM_CH2
TIMx_TISEL
TI2SEL[3:0]
tim_ti2_in[1..15]
tim_ti2f_failing
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