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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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HD404612FS датащи(PDF) 36 Page - Renesas Technology Corp |
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HD404612FS датащи(HTML) 36 Page - Renesas Technology Corp |
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36 / 91 page  HD404618 Series 34 • When the MCU is in watch mode or subactive mode, if the high level period before the falling edge of INT 0 is shorter than the interrupt frame, INT0 is not detected. Also, if the low level period after the falling edge of INT 0 is shorter than the interrupt frame, INT0 is not detected. Edge detection is shown in figure 19. The level of the INT 0 signal is sampled by a sampling clock. When this sampled value changes to low from high, a falling edge is detected. In figure 20, the level of the INT 0 signal is sampled by an interrupt frame. In (a) the sampled value is low at point A, and also low at point B. Therefore, a falling edge is not detected. In (b), the sampled value is high at point A, and also high at point B. A falling edge is not detected in this case either. • When the MCU is in watch mode or subactive mode, keep the high level and low level period of INT 0 longer than interrupt frame. High Low INT Sampling 0 Low Figure 19 Edge Detection A: Low B: Low INT Interrupt frame 0 A: High B: High INT Interrupt frame 0 (a) High level period (b) Low level period Figure 20 Sampling Example |
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