AT89C51RE2 Datasheet, PDF (165/187 Pages) ATMEL Corporation – 8-bit Flash Microcontroller

Reset Output
AT89C51RE2
As detailed in Section “Hardware Watchdog Timer”, page 124, the WDT generates a 96-clock
period pulse on the RST pin. In order to properly propagate this pulse to the rest of the applica-
tion in case of external capacitor or power-supply supervisor circuit, a 1 kΩ resistor must be
added as shown Figure 70.
Figure 70. Recommended Reset Output Schematic
VDD
+
RST
VDD
1K
RST
VSS
To other
on-board
circuitry
7663E–8051–10/08
165