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C161 Datasheet(PDF) 110 Page - Infineon Technologies AG |
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C161 Datasheet(HTML) 110 Page - Infineon Technologies AG |
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110 / 400 page  &3, ,QWHUUXSW DQG 7UDS )XQFWLRQV User’s Manual 5-28 1999-08 External Interrupts During Sleep Mode During Sleep mode all peripheral clock signals are deactivated which also disables the standard edge detection logic for the fast external interrupts. However, transitions on these interrupt inputs must be recognized in order to initiate the wakeup. Therefore during Sleep mode a special edge detection logic for the fast external interrupts (EXzIN) is activated, which requires no clock signal (therefore also works in Sleep mode) and is equipped with an analog noise filter. This filter suppresses spikes (generated by noise) up to 10 ns. Input pulses with a duration of 100 ns minimum are recognized and generate an interrupt request. This filter delays the recognition of an external wakeup signal by approx. 100 ns, but the spike suppression ensures safe and robust operation of the sleep/wakeup mechanism in an active environment. Figure 5-6 Input Noise Filter Operation Input Signal Interrupt Request Rejected Recognized 10ns 100ns |
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