STM32W108CBU6 STMICROELECTRONICS [STMicroelectronics], STM32W108CBU6 Datasheet - Page 98

• Manufacturer Part Number: STM32W108CBU6
• Description: High-performance, IEEE 802.15.4 wireless system-on-chip
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

General-purpose timers
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In PWM mode 1, the reference signal OCyREF is low as long as TIMx_CNT > TIMx_CCRy,
otherwise it becomes high. If the compare value in TIMx_CCRy is greater than the auto-
reload value in TIMx_ARR, then OCyREF is held at 1. Zero-percent PWM is not possible in
this mode.
PWM center-aligned mode
Center-aligned mode is active except when the TIM_CMS bits in the TIMx_CR1 register are
00 (all configurations where TIM_CMS is non-zero have the same effect on the
OCyREF/OCy signals). The compare flag is set when the counter counts up, when it counts
down, or when it counts up and down, depending on the TIM_CMS bits configuration. The
direction bit (TIM_DIR) in the TIMx_CR1 register is updated by hardware and must not be
changed by software. Refer to
more information.
Figure 32
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Figure 32. Center-aligned PWM waveforms (ARR = 8)
TIMx_ARR = 8,
PWM mode is the PWM mode 1,
The output compare flag is set when the counter counts down corresponding to the
center-aligned mode 1 selected for TIM_CMS = 01 in the TIMx_CR1 register.
shows some center-aligned PWM waveforms in an example where:
Doc ID 16252 Rev 2
Center-aligned mode (up/down counting) on page 86
STM32W108CB, STM32W108HB
for