Figure 137. Center-Aligned Pwm Waveforms (Arr=8) - ST STM32G0 1 Series Reference Manual

Advanced-control timer (TIM1)
TIMx_CR1 register is updated by hardware and must not be changed by software. Refer to
the Center-aligned mode (up/down counting) on page
Figure 137
•
TIMx_ARR=8,
•
PWM mode is the PWM mode 1,
•
The flag is set when the counter counts down corresponding to the center-aligned
mode 1 selected for CMS=01 in TIMx_CR1 register.
Counter register
CCRx = 4
CCRx=7
CCRx=8
CCRx>8
CCRx=0
Hints on using center-aligned mode
•
When starting in center-aligned mode, the current up-down configuration is used. It
means that the counter counts up or down depending on the value written in the DIR bit
554/1390
shows some center-aligned PWM waveforms in an example where:

Figure 137. Center-aligned PWM waveforms (ARR=8)

0 1 2
OCxREF
CMS=01
CCxIF
CMS=10
CMS=11
OCxREF
CMS=10 or 11
CCxIF
'1'
OCxREF
CMS=01
CCxIF
CMS=10
CMS=11
'1'
OCxREF
CMS=01
CCxIF
CMS=10
CMS=11
'0'
OCxREF
CMS=01
CCxIF
CMS=10
CMS=11
RM0444 Rev 5
535.
3 4 5 6 7 8 7 6 5 4 3 2
RM0444
1 0 1
AI14681b