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AT89C51AC3-RDTIM Datasheet(PDF) 28 Page - ATMEL Corporation

Part # AT89C51AC3-RDTIM
Description  Enhanced 8-bit Microcontroller with 64KB Flash Memory
PDF  141 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89C51AC3-RDTIM Datasheet(HTML) 28 Page - ATMEL Corporation

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AT89C51AC3
4383A–8051–10/04
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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