The function of pin 18 and 19 (XTAL1 and XTAL2) in 8051 Microcontroller is _______.

Explanation:

The question concerns the function of pins 18 and 19, labeled XTAL1 and XTAL2, in the 8051 Microcontroller. The correct option is to identify that these pins are used for oscillator connection for clock generation.

XTAL1 and XTAL2 in 8051 Microcontroller:

The 8051 microcontroller requires a clock signal to synchronize its operations. This clock signal is generated by an external crystal or resonator connected to the XTAL1 and XTAL2 pins. The crystal oscillator typically provides a stable and precise clock signal by vibrating at a specific frequency when an electrical current is applied. This frequency is then used to drive the internal clock circuitry of the microcontroller.

The external crystal (or ceramic resonator) is connected across XTAL1 and XTAL2. The microcontroller's internal oscillator circuit uses the crystal to generate a stable clock signal. The frequency of this clock signal determines the execution speed of instructions and overall timing of the microcontroller's operations.

The typical connection involves a parallel-resonant crystal connected between XTAL1 and XTAL2, with two capacitors connected from each pin to ground. These capacitors help in stabilizing the oscillator circuit.