General-purpose timer (TIM14) RM0091
354/742 Doc ID 018940 Rev 1
Figure 137. General-purpose timer block diagram (TIM14)
17.3 TIM14 functional description
17.3.1 Time-base unit
The main block of the programmable advanced-control timer is a 16-bit counter with its
related auto-reload register. The counter can count up. The counter clock can be divided by
a prescaler.
The counter, the auto-reload register and the prescaler register can be written or read by
software. This is true even when the counter is running.
The time-base unit includes:
● Counter register (TIMx_CNT)
● Prescaler register (TIMx_PSC)
● Auto-reload register (TIMx_ARR)
The auto-reload register is preloaded. Writing to or reading from the auto-reload register
accesses the preload register. The content of the preload register are transferred into the
shadow register permanently or at each update event (UEV), depending on the auto-reload
preload enable bit (ARPE) in TIMx_CR1 register. The update event is sent when the counter
reaches the overflow and if the UDIS bit equals 0 in the TIMx_CR1 register. It can also be
generated by software. The generation of the update event is described in detailed for each
configuration.
The counter is clocked by the prescaler output CK_CNT, which is enabled only when the
counter enable bit (CEN) in TIMx_CR1 register is set (refer also to the slave mode controller
description to get more details on counter enabling).
Autoreload register
Capture/Compare 1 register
U
U
CC1I
Stop, Clear
output
control
OC1
OC1REF
U
UI
IC1
Prescaler
Input filter &
edge detector
IC1PS
TI1FP1
Reg
event
Notes:
Preload registers transferred
to active registers on U event
according to control bit
interrupt & DMA output
CC1I
TI1
TIMx_CH1
prescaler counter
+/-
CK_PSC
PSC
CNT
CK_CNT
Internal clock (CK_INT)
ai17725b
Trigger
Controller
Enable
counter
TRGO
TIMx_CH1
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