STM32W108CBU6 STMICROELECTRONICS [STMicroelectronics], STM32W108CBU6 Datasheet - Page 95

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

STM32W108CB, STM32W108HB
8.1.7
8.1.8
Figure 29. PWM input mode timing
Forced output mode
In output mode (CCyS bits = 00 in the TIMx_CCMR1 register), software can force each
output compare signal (OCyREF and then OCy) to an active or inactive level independently
of any comparison between the output compare register and the counter.
To force an output compare signal (OCyREF/OCy) to its active level, write 101 in the
TIM_OCyM bits in the corresponding TIMx_CCMR1 register. OCyREF is forced high
(OCyREF is always active high) and OCy gets the opposite value to the TIM_CCyP polarity
bit. For example, TIM_CCyP = 0 defines OCy as active high, so when OCyREF is active,
OCy is also set to a high level.
The OCyREF signal can be forced low by writing the TIM_OCyM bits to 100 in the
TIMx_CCMR1 register.
The comparison between the TIMx_CCRy shadow register and the counter is still performed
and allows the INT_TIMxCCRyIF flag to be set. Interrupt requests can be sent accordingly.
This is described in
Output compare mode
This mode is used to control an output waveform or to indicate when a period of time has
elapsed.
When a match is found between the capture/compare register and the counter, the output
compare function:
●
●
●
Assigns the corresponding output pin to a programmable value defined by the output
compare mode (the TIM_OCyM bits in the TIMx_CCMR1 register) and the output
polarity (the TIM_CCyP bit in the TIMx_CCER register). The output can remain
unchanged (TIM_OCyM = 000), be set active (TIM_OCyM = 001), be set inactive
(TIM_OCyM = 010), or can toggle (TIM_OCyM = 011) on the match.
Sets a flag in the interrupt flag register (the INT_TIMCCyIF bit in the INT_TIMxFLAG
register).
Generates an interrupt if the corresponding interrupt mask is set (the TIM_CCyIF bit in
the INT_TIMxCFG register).
Section 8.1.8: Output compare mode on page
Doc ID 16252 Rev 2
General-purpose timers
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