Discussion
Assertion (A) : PWM signal can be easily generated by 8051.
Reason (R) : It has built in timer/count.
Answer: A
The answer is both (A) and (R) are true and (R) is the correct explanation of (A).
A PWM signal needs a fixed period and an adjustable on-time. The 8051's built-in timer/counters can time both intervals: a timer interrupt toggles a port pin and reloads the timer with the on-time or the off-time in turn, so the duty cycle is set in software without busy-waiting.
The timers are what make PWM easy on the 8051, so R explains A. (The basic 8051 has no dedicated PWM module; derivatives with a PCA add hardware PWM, but the timer method works on every 8051.)
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