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Motore di ricerca datesheet componenti elettronici |
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Motore di ricerca datesheet componenti elettronici |
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ST72521 Scheda tecnica(PDF) 64 Page - STMicroelectronics |
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ST72521 Scheda tecnica(HTML) 64 Page - STMicroelectronics |
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64 / 211 page  ST72521 64/211 PWM AUTO-RELOAD TIMER (Cont’d) Output compare and Time base interrupt On overflow, the OVF flag of the ARTCSR register is set and an overflow interrupt request is generat- ed if the overflow interrupt enable bit, OIE, in the ARTCSR register, is set. The OVF flag must be re- set by the user software. This interrupt can be used as a time base in the application. External clock and event detector mode Using the fEXT external prescaler input clock, the auto-reload timer can be used as an external clock event detector. In this mode, the ARTARR register is used to select the nEVENT number of events to be counted before setting the OVF flag. nEVENT = 256 - ARTARR When entering HALT mode while fEXT is selected, all the timer control registers are frozen but the counter continues to increment. If the OIE bit is set, the next overflow of the counter will generate an interrupt which wakes up the MCU. Figure 40. External Event Detector Example (3 counts) COUNTER t FDh FEh FFh FDh OVF ARTCSR READ INTERRUPT ARTARR=FDh fEXT=fCOUNTER FEh FFh FDh IF OIE=1 INTERRUPT IF OIE=1 ARTCSR READ |
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