In microprocessor-controlled two-way radios, the "watchdog" timer serves what purpose?

The purpose of the "watchdog" timer in microprocessor-controlled two-way radios is to verify program execution. This timer acts as a failsafe mechanism that ensures the microprocessor is running correctly. If the software in the radio becomes unresponsive or enters an infinite loop due to a fault or error, the watchdog timer will time out and reset the program. This prevents the system from remaining in a malfunctioning state and facilitates reliable operation.

Having this verification process is essential, particularly in communication devices where timely processing and responsiveness are crucial for functionality. It ensures that the radio can recover from software glitches and continue to operate effectively, maintaining reliable communication, which is vital for users relying on the device for critical operations.