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AT89C51CC03U-RDTIM データシート(PDF) 31 Page - ATMEL Corporation |
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AT89C51CC03U-RDTIM データシート(HTML) 31 Page - ATMEL Corporation |
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31 / 197 page ![]() 31 AT89C51CC03 4182K–CAN–05/06 Figure 15. Power Fail Detect When the power is applied, the Power Monitor immediately asserts a reset. Once the internal supply after the voltage regulator reach a safety level, the power monitor then looks at the XTAL clock input. The internal reset will remain asserted until the Xtal1 lev- els are above and below VIH and VIL. Further more. An internal counter will count 1024 clock periods before the reset is de-asserted. If the internal power supply falls below a safety level, a reset is immediately asserted. . Vcc t Reset Vcc |
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