Slow PIC® Microcontroller Startup in Freezing Temperatures
Below are links to some app notes that will be helpful in designing the oscillator circuit:
- "Basic PICmicro Oscillator Design"
- "Practical PICmicro Oscillator Analysis and Design"
- "PICmicro Microcontroller Oscillator Design Guide"
- "Basic PIC16/17 Oscillator Design"
In some rare cases, the soldering is not perfect and the freezing temperatures can cause the connection between the solder and the pins to break. When the temperature rises from freezing temperature, the solder connection can recover.