STM32W108HBU6 STMicroelectronics, STM32W108HBU6 Datasheet - Page 123

• Manufacturer Part Number: STM32W108HBU6
• Manufacturer: STMicroelectronics

Specifications of STM32W108HBU6

• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Processing Unit: Microprocessor
• Operating Supply Voltage (min): 1.18V
• Operating Supply Voltage (typ): 1.25V
• Operating Supply Voltage (max): 1.32V
• Package Type: VFQFPN EP
• Pin Count: 40
• Mounting: Surface Mount
• Rad Hardened: No
• Lead Free Status / Rohs Status: Supplier Unconfirmed

STM32W108CB, STM32W108HB
General-purpose timers
The timer is able to generate PWM in edge-aligned mode or center-aligned mode
depending on the TIM_CMS bits in the TIMx_CR1 register.
PWM edge-aligned mode: up-counting configuration
Up-counting is active when the TIM_DIR bit in the TIMx_CR1 register is low. Refer to
Up-
counting mode on page
108.
The following example uses PWM mode 1. The reference PWM signal OCyREF is high as
long as TIMx_CNT < TIMx_CCRy, otherwise it becomes low. If the compare value in
TIMx_CCRy is greater than the auto-reload value in TIMx_ARR, then OCyREF is held at 1.
If the compare value is 0, then OCyREF is held at 0.
Figure 35
shows some edge-aligned
PWM waveforms in an example, where TIMx_ARR = 8.
Figure 35. Edge-aligned PWM waveforms (ARR = 8)
PWM edge-aligned mode: down-counting configuration
Down-counting is active when the TIM_DIR bit in the TIMx_CR1 register is high. Refer to
Down-counting mode on page 110
for more information.
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
Center-aligned mode (up/down counting) on page 111
for
more information.
Doc ID 16252 Rev 7
123/208