Will the Crystal Oscillator Work in the Absence of Program or Program Error Conditions?
Will the xo crystal xo crystal oscillator Work in the Absence of Program or Program Error Conditions?
The answer is :NO!
The working relationship between the program and the external crystal xo crystal oscillator is explained as follows:
After power-on, when the system switches from the internal clock source to a more accurate external clock source provided by the crystal xo crystal oscillator,
the Single chip machine hardware will try to apply voltage to both ends of the external crystal xo crystal oscillator
through the program to provide excitation power （Drive Level=100μW Typical）and to determine
whether the external crystal is working properly. If the crystal xo crystal oscillator has worked properly and output the required clock signal,
then the system will switch to the external crystal xo crystal oscillator clock source and the system will start normally after completing the diagnosis. Conversely, if the crystal xo crystal oscillator is not working properly, the system may crash and cause a poor boot.
PS:
1. The internal clock source refers to the internal low frequency RC xo crystal oscillator of the Single chip machine.
2. The "crystal xo crystal oscillator" in this article refers to the passive xo crystal xo crystal oscillator, that is, quartz crystal resonator,
rather than active xo crystal xo crystal oscillator (quartz xo crystal xo crystal oscillator).