ST STM32G0 1 Series User Manual

Advanced-control timer (TIM1) RM0444
590/1390 RM0444 Rev 5
21.4.4 TIM1 DMA/interrupt enable register (TIM1_DIER)
Address offset: 0x0C
Reset value: 0x0000
Bit 3 OCCS: OCREF clear selection
This bit is used to select the OCREF clear source.
0: OCREF_CLR_INT is connected to COMP1 or COMP2 output depending on
TIM1_OR1.OCREF_CLR
1: OCREF_CLR_INT is connected to ETRF
Bits 16, 2, 1, 0 SMS[3:0]: Slave mode selection
When external signals are selected the active edge of the trigger signal (TRGI) is linked to
the polarity selected on the external input (see Input Control register and Control Register
description.
0000: Slave mode disabled - if CEN = ‘1’ then the prescaler is clocked directly by the internal
clock.
0001: Encoder mode 1 - Counter counts up/down on TI1FP1 edge depending on TI2FP2
level.
0010: Encoder mode 2 - Counter counts up/down on TI2FP2 edge depending on TI1FP1
level.
0011: Encoder mode 3 - Counter counts up/down on both TI1FP1 and TI2FP2 edges
depending on the level of the other input.
0100: Reset Mode - Rising edge of the selected trigger input (TRGI) reinitializes the counter
and generates an update of the registers.
0101: Gated Mode - The counter clock is enabled when the trigger input (TRGI) is high. The
counter stops (but is not reset) as soon as the trigger becomes low. Both start and stop of
the counter are controlled.
0110: Trigger Mode - The counter starts at a rising edge of the trigger TRGI (but it is not
reset). Only the start of the counter is controlled.
0111: External Clock Mode 1 - Rising edges of the selected trigger (TRGI) clock the counter.
1000: Combined reset + trigger mode - Rising edge of the selected trigger input (TRGI)
reinitializes the counter, generates an update of the registers and starts the counter.
Codes above 1000: Reserved.
Note: The gated mode must not be used if TI1F_ED is selected as the trigger input
(TS=00100). Indeed, TI1F_ED outputs 1 pulse for each transition on TI1F, whereas the
gated mode checks the level of the trigger signal.
Note: The clock of the slave peripherals (timer, ADC, ...) receiving the TRGO or the TRGO2
signals must be enabled prior to receive events from the master timer, and the clock
frequency (prescaler) must not be changed on-the-fly while triggers are received from
the master timer.
Table 115. TIM1 internal trigger connection
Slave TIM ITR0 (TS = 00000) ITR1 (TS = 00001) ITR2 (TS = 00010) ITR3 (TS = 00011)
TIM1 TIM15 TIM2 TIM3 TIM17 OC1
1514131211109876543210
Res. TDE COMDE CC4DE CC3DE CC2DE CC1DE UDE BIE TIE COMIE CC4IE CC3IE CC2IE CC1IE UIE
rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw

ST STM32G0 1 Series Specifications

General

Brand	ST
Model	STM32G0 1 Series
Category	Microcontrollers
Language	English