Previous Year Question
When a timer in the 8051 microcontroller is programmed as a counter, to which pin is the external clock pulse applied for Timer 0?
Correct answer: D
Explanation
The 8051 assigns the external counter input T0 to port pin P3.4. Timer 1 uses T1 on P3.5, so Timer 0 counter pulses must be applied to P3.4.
Step-by-step solution
Correct Answer
D — P3.4
Explanation
The 8051 assigns the external counter input T0 to port pin P3.4. Timer 1 uses T1 on P3.5, so Timer 0 counter pulses must be applied to P3.4.
Key Concept
Timer 0 External Input T0
Exam Point
8051: T0=P3.4, T1=P3.5.
Exam tip
8051: T0=P3.4, T1=P3.5.
Quick method
8051: T0=P3.4, T1=P3.5.