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General-purpose timer (TIMx) RM0008 14.3.10 One pulse mode One Pulse Mode (OPM) is a particular case of the previous modes. It allows the counter to be started in response to a stimulus and to generate a pulse with a programmable length after a programmable delay. Starting the counter can be controlled through the slave mode controller. Generating the waveform can be done in output compare mode or PWM mode. You select One Pulse Mode by setting the OPM bit in the TIMx_CR1 register. This makes the counter stop automatically at the next update event UEV. A pulse can be correctly generated only if the compare value is different from the counter initial value. Before starting (when the timer is waiting for the trigger), the configuration must be: In upcounting: CNT
RM0008 General-purpose timer (TIMx) The OPM waveform is defined by writing the compare registers (taking into account the clock frequency and the counter prescaler). ● The t DELAY is defined by the value written in the TIMx_CCR1 register. ● The t PULSE is defined by the difference between the auto-reload value and the compare value (TIMx_ARR - TIMx_CCR1). ● Let’s say you want to build a waveform with a transition from ‘0’ to ‘1’ when a compare match occurs and a transition from ‘1’ to ‘0’ when the counter reaches the auto-reload value. To do this you enable PWM mode 2 by writing OC1M=111 in the TIMx_CCMR1 register. You can optionally enable the preload registers by writing OC1PE=’1’ in the TIMx_CCMR1 register and ARPE in the TIMx_CR1 register. In this case you have to write the compare value in the TIMx_CCR1 register, the auto-reload value in the TIMx_ARR register, generate an update by setting the UG bit and wait for external trigger event on TI2. CC1P is written to ‘0’ in this example. In our example, the DIR and CMS bits in the TIMx_CR1 register should be low. You only want 1 pulse, so you write ‘1’ in the OPM bit in the TIMx_CR1 register to stop the counter at the next update event (when the counter rolls over from the auto-reload value back to 0). Particular case: OCx fast enable: In One Pulse Mode, the edge detection on TIx input set the CEN bit which enables the counter. Then the comparison between the counter and the compare value makes the output toggle. But several clock cycles are needed for these operations and it limits the minimum delay t DELAY min we can get. If you want to output a waveform with the minimum delay, you can set the OCxFE bit in the TIMx_CCMRx register. Then OCxRef (and OCx) is forced in response to the stimulus, without taking in account the comparison. Its new level is the same as if a compare match had occurred. OCxFE acts only if the channel is configured in PWM1 or PWM2 mode. 14.3.11 Clearing the OCxREF signal on an external event The OCxREF signal for a given channel can be reset by applying a High level on the ETRF input (OCxCE enable bit of the corresponding TIMx_CCMRx register set to ‘1’). The OCxREF remains low until the next update event, UEV, occurs. This function can be only used in output compare mode and PWM mode. It does not work in forced mode. For example, the OCxREF signal can be connected to the output of a comparator to be used for current handling. In this case, the ETR must be configured as follow: 1. The external trigger prescaler should be kept off: bits ETPS[1:0] of the TIMx_SMCR register set to ‘00’. 2. The external clock mode 2 must be disabled: bit ECE of the TIM1_SMCR register set to ‘0’. 3. The external trigger polarity (ETP) and the external trigger filter (ETF) can be configured according to the user needs. Figure 132 shows the behavior of the OCxREF signal when the ETRF Input becomes High, for both values of the enable bit OCxCE. In this example, the timer TIMx is programmed in PWM mode. Doc ID 13902 Rev 9 343/995
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RM0008 Reference manual STM32F101xx
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RM0008 Contents 4.3.1 Slowing down
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RM0008 Contents 7.3.4 APB2 peripher
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RM0008 Contents 10.1 DMA introducti
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RM0008 Contents 12.3.2 DAC output b
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RM0008 Contents 13.4.6 TIM1&TIM8 ev
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RM0008 Contents 15.4.8 TIM6&TIM7 au
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RM0008 Contents 20 Secure digital i
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RM0008 Contents 21.5.2 Endpoint-spe
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RM0008 Contents 23.5.10 SPI registe
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RM0008 Contents 26.5 USB peripheral
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RM0008 Contents 27.7 Ethernet inter
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RM0008 List of tables List of table
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RM0008 List of tables Table 100. FS
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RM0008 List of tables Table 202. Pa
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RM0008 List of figures Figure 49. D
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RM0008 List of figures preloaded).
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RM0008 List of figures Figure 255.
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RM0008 Documentation conventions 1
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RM0008 Memory and bus architecture
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RM0008 CRC calculation unit 3.3 CRC
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RM0008 Power control (PWR) 4 Power
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RM0008 Power control (PWR) Note: Du
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RM0008 Power control (PWR) 4.3 Low-
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RM0008 Power control (PWR) Table 9.
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RM0008 Power control (PWR) switched
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RM0008 Power control (PWR) Bit 8 DB
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RM0008 Power control (PWR) 4.4.3 PW
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RM0008 Backup registers (BKP) 5.3 B
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RM0008 Backup registers (BKP) Bit 6
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RM0008 Backup registers (BKP) Table
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RM0008 Backup registers (BKP) Table
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RM0008 Interrupts and events 9 Inte
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RM0008 Interrupts and events Table
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RM0008 Interrupts and events Table
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. RM0008 Interrupts and events 9.2.
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RM0008 Interrupts and events Figure
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RM0008 Interrupts and events 9.3.3
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RM0008 Interrupts and events 9.3.7
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RM0008 DMA controller (DMA) Figure
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RM0008 DMA controller (DMA) Table 5
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RM0008 DMA controller (DMA) 10.4 DM
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RM0008 DMA controller (DMA) 10.4.3
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RM0008 DMA controller (DMA) 10.4.5
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RM0008 DMA controller (DMA) Table 5
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RM0008 Analog-to-digital converter
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RM0008 Real-time clock (RTC) 16.4.2
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RM0008 Real-time clock (RTC) 16.4.6
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RM0008 Independent watchdog (IWDG)
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RM0008 Window watchdog (WWDG) Figur
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RM0008 Window watchdog (WWDG) 18.6
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RM0008 Ethernet (ETH): media access
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RM0008 Device electronic signature
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RM0008 Debug support (DBG) Figure 3
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RM0008 Revision history 30 Revision
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RM0008 Index ETH_MACMIIDR . . . . .
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RM0008 Please Read Carefully: Infor
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