Modify Temperature Limit in C Code

I need assistance modifying existing C code for a Nuvoton microcontroller.

Requirements:
- Change temperature range to -20 to 80°C.
- Error handling: activate alert when temperature ≤ -2°C.
- Existing alert mechanism should remain functional.

Ideal Skills & Experience:
- Proficiency in C programming.
- Experience with Nuvoton microcontrollers.
- Knowledge of temperature sensors and error handling in embedded systems.

Please ensure the modified code maintains current functionality and integrates the new requirements seamlessly.