ST STM32G0 1 Series User Manual

RM0444 Rev 5 541/1390
RM0444 Advanced-control timer (TIM1)
624
21.3.4 External trigger input
The timer features an external trigger input ETR. It can be used as:
• external clock (external clock mode 2, see Section 21.3.5)
• trigger for the slave mode (see Section 21.3.26)
• PWM reset input for cycle-by-cycle current regulation (see Section 21.3.7)
Figure 122 below describes the ETR input conditioning. The input polarity is defined with the
ETP bit in TIMxSMCR register. The trigger can be prescaled with the divider programmed
by the ETPS[1:0] bitfield and digitally filtered with the ETF[3:0] bitfield.
Figure 122. External trigger input block
The ETR input comes from multiple sources: input pins (default configuration), comparator
outputs and analog watchdogs. The selection is done with the ETRSEL[3:0] bitfield.
Figure 123. TIM1 ETR input circuitry
1. Available on STM32G0B1xx and STM32G0C1xx salestypes only.
MS34403V2
To the Output mode controller
To the CK_PSC circuitry
To the Slave mode controller
0
1
ETR input
ETR
ETP
TIMx_SMCR
Divider
/1, /2, /4, /8
ETPS[1:0]
TIMx_SMCR
Filter
downcounter
ETF[3:0]
TIMx_SMCR
ETRP
f
DTS
MSv45739V2
TIM1_AF1[17:14]
ETR input
ETR inputs from AF controller
COMP1 output
COMP2 output
NC
ADC1 AWD1
ADC1 AWD2
ADC1 AWD3
COMP3
(1)

ST STM32G0 1 Series Specifications

General

Brand	ST
Model	STM32G0 1 Series
Category	Microcontrollers
Language	English