The types of chip resetters mainly include the following:
Differential reset circuit: This circuit consists of a resistor and a capacitor, and usually also includes a manual reset button. When the system is powered on, the capacitor is equivalent to a path, and the reset pin is high at the moment of power-on. As the resistor discharges, the voltage gradually decreases, and finally reaches a low level to complete the reset. The reset signal pulse width of this circuit is usually between 20 and 200 milliseconds.
Integral reset circuit: Similar to the differential reset circuit, but the positions of the resistor and capacitor are interchanged, resulting in the reset pin being low after power-on. As the capacitor charges, the voltage gradually increases and remains at a high level. This circuit is usually called a "low-level" reset circuit.
Comparator reset circuit: This circuit uses a comparator to detect whether the power supply voltage reaches a preset threshold. When the power supply voltage reaches the threshold, the comparator outputs a reset signal to trigger the microcontroller reset. This circuit is suitable for occasions where precise control of reset conditions is required.
Watchdog reset circuit: This circuit monitors the running status of the program. When the program enters an infinite loop or stagnates, the watchdog timer times out and generates a reset signal to prevent the system from crashing. It is suitable for occasions where the running status of the program needs to be monitored.
Cold reset and hot reset: Cold reset is a power-off restart with the power completely removed, which is equivalent to shutting down and restarting. It can completely reset all registers and perform initialization operations. Hot reset is a forced restart without power failure. It only resets specific registers and does not trigger initialization operations.
Soft reset and hard reset: Soft reset is implemented by software and is completed by running a specific reset code or sending a reset command. Hard reset is implemented by hardware circuits, and the entire hardware system is forced to reset to the initial state. Soft reset saves hardware resources but relies on software correctness. Although hard reset requires additional hardware, it is more stable and reliable.
