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AT89C51AC3-RDTIM 数据表(PDF) 29 Page - ATMEL Corporation

部件名 AT89C51AC3-RDTIM
功能描述  Enhanced 8-bit Microcontroller with 64KB Flash Memory
PDF  140 Pages
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制造商  ATMEL [ATMEL Corporation]
网页  http://www.atmel.com
标志 ATMEL - ATMEL Corporation

AT89C51AC3-RDTIM 数据表(HTML) 29 Page - ATMEL Corporation

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AT89C51AC3
4383D–8051–02/08
Reset
Introduction
The reset sources are : Power Management, Hardware Watchdog, PCA Watchdog and
Reset input.
Figure 16. Reset Schematic
Reset Input
The Reset input can be used to force a reset pulse longer than the internal reset con-
trolled by the Power Monitor. RST input has a pull-down resistor allowing power-on
reset by simply connecting an external capacitor to VCC as shown in Figure 17. Resistor
value and input characteristics are discussed in the Section “DC Characteristics” of the
AT89C51AC3 datasheet. The status of the Port pins during reset is detailed in Table 9.
Figure 17. Reset Circuitry and Power-On Reset
Power
Monitor
Hardware
Watchdog
PCA
Watchdog
RST
Internal Reset
RST
VSS
To internal reset
RST
VDD
+
b. Power-on Reset
a. RST input circuitry



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