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WM8953ECS/RV 数据表(PDF) 54 Page - Wolfson Microelectronics plc |
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WM8953ECS/RV 数据表(HTML) 54 Page - Wolfson Microelectronics plc |
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54 / 100 page  WM8953 Production Data w PD, January 2009, Rev 4.0 54 The GPIO input or internal Interrupt event (eg. MICBIAS current detect) is latched as illustrated below: Figure 25 GPIO Latch The de-bounce function on the GPIO input pins enables transient behaviour to be filtered as illustrated below: Figure 26 GPIO De-bounce To implement an edge detect function on a GPIO input, the GPIOn_POL bits may be used to alternate the GPIO polarity after each edge transition. For example, after a logic 1 has caused an Interrupt event, the polarity may be inverted prior to resetting the Interrupt register bit. In this way, the next interrupt event generated by this GPIO will occur when it returns to the logic 0 state. The GPIOn_POL bit must be reversed after every GPIO edge transition, as illustrated below: Figure 27 GPIO Edge Detect |
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