STM32L4低功耗定时器(LPTIM)介绍

• Timeout function for wakeup from low power modes
LPTIM Features (1/3)
• Up to 5 clock sources to achieve lowest power consumption
• APB clock • LP oscillators: LSE, LSI, HSI • External clock
LPTIM Features (2/3)
• Up to 3 configurable waveforms
• PWM waveform • One Pulse waveform • Set Once waveform
LPTIMx_ARR LPTIMx_CMP
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POL = 0
PWM OnePulse SetOnce
• With configurable active edge: Rising edge, Falling edge and Both edges • When both edges configuration is chosen, an auxiliary clock source is needed with a frequency 4 times bigger, at least, than the external signal
Useful when LPTIM is clocked by a clock source different from APB
• Direction change interrupt; used by Encoder mode
Low Power Timer LPTIM
Microcontrollers Division – Application Support Solutions Team March 2013
Features Summary
• Asynchronous running capability
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• Ultra low power-consumption
LPTIM Features (3/3)
• Encoder mode
• Same operation as Encoder mode on General Purpose Timers • Only available when LPTimer runs in Continuous mode
Байду номын сангаас61
• Up to 6 interrupt sources
• Compare match interrupt • Auto-reload match interrupt • External trigger event interrupt • Auto-reload register write completed interrupt • Compare register write completed interrupt
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• Up to 8 external triggers
• With configurable active edges: Rising edge, Falling edge and Both edges • With digital glitch filter to avoid spurious triggers
• Up to 2 operation modes
• Continuous mode: free running mode; many counter overruns are possible • One Shot mode: Counter stops counting when the overrun value is reached