For 8051 microcontroller operating at a frequency of 11.0592 MHz, how long will it take to execute the instruction MUL AB?
Q. For 8051 microcontroller operating at a frequency
of 11.0592 MHz, how long will it take to execute
the instruction MUL AB?
1. 1.085 μs
2. 2.17 μs
3. 3.255 μs
4. 4.34 μs
✓ Correct Answer
Step-by-Step Solution
Given:
- Microcontroller: 8051
- Clock frequency: 11.0592 MHz
- Instruction: MUL AB
Step 1: Calculate Machine Cycle Time
For a standard 8051 microcontroller, 1 machine cycle = 12 clock cycles.
TMC = 12 / f
= 12 / (11.0592 × 106)
= 1.085 μs
Step 2: Calculate Execution Time
The MUL AB instruction requires 4 machine cycles.
Execution Time = 4 × 1.085
= 4.34 μs
ANSWER
Option 4: 4.34 μs