AT89C5122D-RDRUM datasheet(171/208 Pages) ATMEL

部件名	AT89C5122D-RDRUM

功能描述	C51 Microcontroller with USB and Smart Card Reader Interfaces

PDF	208 Pages

Scroll/Zoom	100%

制造商	ATMEL [ATMEL Corporation]

网页	http://www.atmel.com

标志

171 / 208 page

171

AT83R5122, AT8xC5122/23

4202F–SCR–07/2008

Power On Reset (POR)

The role of the POR is to monitor the power supply rise of the microcontroller core and

release the internal reset only when the internal voltage exceeds the VPFDP threshold

from which the microcontroller core is stable (see Figure 101). This feature replaces the

external reset function and therefore avoid the use of external components on the reset

pin.

Power Fail Detector

(PFD)

The role of the PFD is to monitor the power supply falls during a steady state condition

in order to suspend the microcontroller and peripherals activity as soon as the power

supply drops below the VPFDM threshold from which the microcontroller’s core might

become instable (see Figure 101). The PDF suspends the microcontroller’s activity by

holding the microcontroller under a reset state to avoid an unpredictable behaviour.

A filter prevents the system from reseting when glitches lower than 50 ns duration are

carried on Vcore. See Figure 101 and Figure 102 on page 172.

AT89C5122D-RDRUM 数据表(PDF) 171 Page - ATMEL Corporation