Datasheet

6
7764A–8051–11/07
1.2.2 How to drive the RST pin according to the features implemented on the device
This procedure is only applicable to Active High reset pins. However, this procedure can be eas-
ily adapted for microcontrollers with Active Low Reset pins.
1.2.2.1 POR not implemented
When the POR is not implemented, it is necessary to implement external components to assure
a correct reset of the MCU.
a) Using an external capacitor
Read application note “ How to calculate the capacitor of the reset input of a C51 microcontrol-
ler” (doc 4284).
Internal pull-up
External Pull-up
RST
Internal Reset
Microcontroller
C
R
VCC
RST
Internal Reset
Microcontroller
C
R
VCC