AT89C5131A-RDTIL datasheet(151/185 Pages) ATMEL

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AT89C5131A-RDTIL データシート(PDF) 151 Page - ATMEL Corporation

部品番号	AT89C5131A-RDTIL

部品情報	8-bit Flash Microcontroller with Full Speed USB Device

PDF	185 Pages

Scroll/Zoom	100%

メーカー	ATMEL [ATMEL Corporation]

ホームページ	http://www.atmel.com

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151 / 185 page

151

AT89C5131A-L

4338E–USB–06/06

The Power fail detect monitor the supply generated by the voltage regulator and gener-

ate a reset if this supply falls below a safety threshold as illustrated in the Figure 75

below.

Figure 75. 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

Reset

Vcc

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