This application note discusses the Fail-Safe
Monitoring and Clock Switching features on the new
8/14/20-pin Flash microcontroller family. This new
family of microcontrollers takes Microchip's Mid-Range
Family of products to the next level with its new 8 MHz
internal oscillator that can be switched in real time from
8 MHz down to 31 kHz (8 steps). In addition, the device
contains a fail-safe feature that monitors the external
(primary) oscillator and will automatically switch over to
the internal (secondary) oscillator if the primary
oscillator fails. These new features make applications
more robust in the event of a primary oscillator failure
and allow greater flexibility by using the clock
frequency switching capabilities of the internal
oscillator. AN892
Fail-Safe Monitoring and Clock Frequency Switching Using
the PIC16F684
MONITORING FOR AN EXTERNAL
Author: Michael Rylee OSCILLATOR FAILURE
Microchip Technology Inc.
OSCCON (OSTS) indicates whether the device is
running from the primary or secondary oscillator. When
INTRODUCTION a failure on the primary oscillator is detected, the
This application note discusses the Fail-Safe devi……
