Reset; Introduction; Reset Input - Atmel AT89C5131A-L Manual

Reset

Introduction

Reset Input

AT89C5131A-L
148
The reset sources are: Power Management, Hardware Watchdog, PCA Watchdog and
Reset input.
Figure 72. Reset schematic
Power
Monitor
Hardware
Watchdog
PCA
Watchdog
RST
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-up resistor allowing power-on reset
by simply connecting an external capacitor to V
and input characteristics are discussed in the Section "DC Characteristics" of the
AT89C5131A-L datasheet.
Figure 73. Reset Circuitry and Power-On Reset
VCC
RST
a. RST input circuitry
as shown in Figure 73. Resistor value
SS
To internal reset
Internal Reset
RST
+
VSS
b. Power-on Reset
4338F–USB–08/07