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ST9 データシート(PDF) 83 Page - STMicroelectronics |
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ST9 データシート(HTML) 83 Page - STMicroelectronics |
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83 / 146 page  83/146 ST9 USER GUIDE that are symmetrically centred on half of the reload value. For example, if the reload value is 255, the compare registers are set to the following values: You need to ensure that the compare registers are not written while they are used for a com- parison. Because of this, they are written in an interrupt service routine that is triggered by the MFT itself. To allow maximum latency time, the interrupt is triggered either by a compare 0 or a compare 1 event, according to the value of the duty cycle. For duty cycles between 0 and 50%, the compare 0 event is used. Between 50% and 100%, the compare 1 event is used. The following figures shows the timing diagram. Figure 44 . Output A Timing Duty Cycle Compare Register 0 Compare Register 1 10% 115 140 25% 96 159 50% 64 191 75% 32 223 90% 13 242 Output A Reload Value Compare Register 1 Value Compare Register 0 Value Reload Interrupt |
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