RM0440 Rev 4 1119/2126
RM0440 Advanced-control timers (TIM1/TIM8/TIM20)
1226
(DIR) in the 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 1100.
Figure 303 shows some center-aligned PWM waveforms in an example where:
• 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.
Figure 303. Center-aligned PWM waveforms (ARR=8)
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
MSv62328V1
CCxIF
012345678765432 101
Counter register
CCRx = 4
tim_ocxref
CMS=01
CMS=10
CMS=11
CCxIF
CCRx=7
tim_ocxref
CMS=10 or 11
CCxIF
CCRx=8
tim_ocxref
CMS=01
CMS=10
CMS=11
‘1’
CCxIF
CCRx>8
tim_ocxref
CMS=01
CMS=10
CMS=11
‘1’
CCxIF
CCRx=0
tim_ocxref
CMS=01
CMS=10
CMS=11
‘0’
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